Error: invalid BigNumber string from PancakeSwap trading bot

[jklepatch]

Error: invalid BigNumber string from PancakeSwap trading bot

[DeVoresyah]

same here

[beejaz]

Okay, so I got this error because if this line
https://github.com/jklepatch/eattheblocks/blob/master/screencast/348-pancakeswap-trading-bot/bot.js#L41

I had to use '1' or larger amount on approve. But now I get this error instead:

(node:21550) UnhandledPromiseRejectionWarning: TypeError: tx.wait is not a function
    at init (/home/pancake-trading-bot/bot.js:44:28)
    at process._tickCallback (internal/process/next_tick.js:68:7)
(node:21550) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). (rejection id: 1)
(node:21550) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.

Which I dont understand either because wbnb.approve returns bool so tx = true, there is no function called wait

[DeVoresyah]

Okay, so I got this error because if this line
https://github.com/jklepatch/eattheblocks/blob/master/screencast/348-pancakeswap-trading-bot/bot.js#L41

I had to use '1' or larger amount on approve. But now I get this error instead:

(node:21550) UnhandledPromiseRejectionWarning: TypeError: tx.wait is not a function
    at init (/home/pancake-trading-bot/bot.js:44:28)
    at process._tickCallback (internal/process/next_tick.js:68:7)
(node:21550) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). (rejection id: 1)
(node:21550) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.

Which I dont understand either because wbnb.approve returns bool so tx = true, there is no function called wait

I already solved my previous problem above, but I got this error

UnhandledPromiseRejectionWarning: Error: cannot estimate gas; transaction may fail or may require manual gas limit (error={"reason":"cannot estimate gas; transaction may fail or may require manual gas limit","code":"UNPREDICTABLE_GAS_LIMIT"

[ozgurk78]

I have same problem , What can we do?

(node:15408) UnhandledPromiseRejectionWarning: Error: invalid BigNumber string (argument="value", value="replace by amount covering several trades", code=INVALID_ARGUMENT, version=bignumber/5.0.15)

[ivekivek]

I have same problem , What can we do?

(node:15408) UnhandledPromiseRejectionWarning: Error: invalid BigNumber string (argument="value", value="replace by amount covering several trades", code=INVALID_ARGUMENT, version=bignumber/5.0.15)

You need to replace "replace by amount covering several trades" with value, put "1" or more.
Anyway after solving this one, I got "tx.wait() is not function" and solve this, but can see he solve it too yesterday. After that we need to figure out how to solve gas estimate error. I think it should work with this, not sure, but it worked with Uniswap.

We need to set gas price and limit manual.

const tx = await router.swapExactTokensForTokens(
    amountIn,
    amountOutMin,
    [tokenIn, tokenOut],
    addresses.recipient,
    {
      value: '0',
      gasPrice: ethers.BigNumber.from(1000000).toHexString(),
      gasLimit: ethers.BigNumber.from(1000000).toHexString() 
    },
    Date.now() + 1000 * 60 * 10, // 10 minutes
); 

[thekooldev1232]

Yea this is the error where I am stuck too !! Hope this helps 🤘

[ivekivek]

Yea this is the error where I am stuck too !! Hope this helps 🤘

Try it and let know

[DioLorenzo]

Promise {
ReferenceError: wbnb is not defined
at init (REPL45:2:14)
at REPL415:1:1
at Script.runInThisContext (vm.js:133:18)
at REPLServer.defaultEval (repl.js:486:29)
at bound (domain.js:416:15)
at REPLServer.runBound [as eval] (domain.js:427:12)
at REPLServer.onLine (repl.js:819:10)
at REPLServer.emit (events.js:388:22)
at REPLServer.emit (domain.js:470:12)
at REPLServer.Interface._onLine (readline.js:342:10)
}

(node:76719) UnhandledPromiseRejectionWarning: ReferenceError: wbnb is not defined
at init (REPL45:2:14)
at REPL415:1:1
at Script.runInThisContext (vm.js:133:18)
at REPLServer.defaultEval (repl.js:486:29)
at bound (domain.js:416:15)
at REPLServer.runBound [as eval] (domain.js:427:12)
at REPLServer.onLine (repl.js:819:10)
at REPLServer.emit (events.js:388:22)
at REPLServer.emit (domain.js:470:12)
at REPLServer.Interface._onLine (readline.js:342:10)
(node:76719) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). To terminate the node process on unhandled promise rejection, use the CLI flag --unhandled-rejections=strict (see https://nodejs.org/api/cli.html#cli_unhandled_rejections_mode). (rejection id: 4)

I have this error, how I can solve it?

[mujahidazamcsm]

Hello Everyone..

Getting this error.. any idea how to fix this?

events.js:174 throw er; // unhandled 'error' event

[ivekivek]

Promise {
ReferenceError: wbnb is not defined
at init (REPL45:2:14)
at REPL415:1:1
at Script.runInThisContext (vm.js:133:18)
at REPLServer.defaultEval (repl.js:486:29)
at bound (domain.js:416:15)
at REPLServer.runBound [as eval] (domain.js:427:12)
at REPLServer.onLine (repl.js:819:10)
at REPLServer.emit (events.js:388:22)
at REPLServer.emit (domain.js:470:12)
at REPLServer.Interface._onLine (readline.js:342:10)
}

(node:76719) UnhandledPromiseRejectionWarning: ReferenceError: wbnb is not defined
at init (REPL45:2:14)
at REPL415:1:1
at Script.runInThisContext (vm.js:133:18)
at REPLServer.defaultEval (repl.js:486:29)
at bound (domain.js:416:15)
at REPLServer.runBound [as eval] (domain.js:427:12)
at REPLServer.onLine (repl.js:819:10)
at REPLServer.emit (events.js:388:22)
at REPLServer.emit (domain.js:470:12)
at REPLServer.Interface._onLine (readline.js:342:10)
(node:76719) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). To terminate the node process on unhandled promise rejection, use the CLI flag --unhandled-rejections=strict (see https://nodejs.org/api/cli.html#cli_unhandled_rejections_mode). (rejection id: 4)

I have this error, how I can solve it?

Can you share your code?

[ivekivek]

Hello Everyone..

Getting this error.. any idea how to fix this?

events.js:174 throw er; // unhandled 'error' event

Can you share code?

[DioLorenzo]

Hello Everyone..
Getting this error.. any idea how to fix this?
events.js:174 throw er; // unhandled 'error' event

Can you share code?

const provider = new ethers.providers.WebSocketProvider('my url here in https not wss')
const account = wallet.connect(provider);
const factory = new ethers.Contract(
addresses.factory,
['event PairCreated(address indexed token0, address indexed token1, address pair, uint)'],
account
);
const router = new ethers.Contract(
addresses.router,
[
'function getAmountsOut(uint amountIn, address[] memory path) public returns (uint[] memory amounts)',
'function swapExactTokensForTokens(uint amountIn, uint amountOutMin, address[] calldata path, address to, uint deadline) external returns (uint[] memory amounts)'
],
account
);

const wbnb = new ethers.Contract(
addresses.WBNB,
[
'function approve(address spender, uint amount) public returns(bool)',
],
account
);

const init = async () => {
const tx = await wbnb.approve(
router.address,
'10'
);
const receipt = await tx.wait();
console.log('Transaction receipt');
console.log(receipt);
}

factory.on('PairCreated', async (token0, token1, pairAddress) => {
console.log(New pair detected ================= token0: ${token0} token1: ${token1} pairAddress: ${pairAddress});

//The quote currency needs to be WBNB (we will pay with WBNB)
let tokenIn, tokenOut;
if(token0 === addresses.WBNB) {
tokenIn = token0;
tokenOut = token1;
}

if(token1 == addresses.WBNB) {
tokenIn = token1;
tokenOut = token0;
}

//The quote currency is not WBNB
if(typeof tokenIn === 'undefined') {
return;
}

//We buy for 0.1 BNB of the new token
//ethers was originally created for Ethereum, both also work for BSC
//'ether' === 'bnb' on BSC
const amountIn = ethers.utils.parseUnits('0.001', 'ether');
const amounts = await router.getAmountsOut(amountIn, [tokenIn, tokenOut]);
//Our execution price will be a bit different, we need some flexbility
const amountOutMin = amounts[1].sub(amounts[1].div(10));
console.log(Buying new token ================= tokenIn: ${amountIn.toString()} ${tokenIn} (WBNB) tokenOut: ${amounOutMin.toString()} ${tokenOut});
const tx = await router.swapExactTokensForTokens(
amountIn,
amountOutMin,
[tokenIn, tokenOut],
addresses.recipient,
{
value: '0',
gasPrice: ethers.BigNumber.from(1000000).toHexString(),
gasLimit: ethers.BigNumber.from(1000000).toHexString()
},
Date.now() + 1000 * 60 * 10, // 10 minutes
);
const receipt = await tx.wait();
console.log('Transaction receipt');
console.log(receipt);
});

init();

[mujahidazamcsm]

Hello Everyone..
Getting this error.. any idea how to fix this?
events.js:174 throw er; // unhandled 'error' event

Can you share code?

Hi @ivekivek,

It is pretty much the stock code.. just commented out a few lines as I dont want to make a purchase or approve WBNB.. added logs.. to see where it is failing.. let me know if u r able to get it to work

const ethers = require('ethers');

const addresses = {
WBNB: '0xbb4cdb9cbd36b01bd1cbaebf2de08d9173bc095c',
factory: '0xcA143Ce32Fe78f1f7019d7d551a6402fC5350c73',
router: '0x10ED43C718714eb63d5aA57B78B54704E256024E',
recipient: '- put ur address here'
}

//First address of this mnemonic must have enough BNB to pay for tx fess
const mnemonic = '- put ur mnemonic here'

const provider = new ethers.providers.WebSocketProvider('wss://apis.ankr.com/wss/....'); //Ankr websocket url to mainnet
console.log('provider');
//console.log(provider);
const wallet = ethers.Wallet.fromMnemonic(mnemonic);
console.log('wallet');
//console.log(wallet);
const account = wallet.connect(provider);
console.log('account');
//console.log(account);
const factory = new ethers.Contract(
addresses.factory,
['event PairCreated(address indexed token0, address indexed token1, address pair, uint)'],
account
);
console.log('factory');
//console.log(factory);
const router = new ethers.Contract(
addresses.router,
[
'function getAmountsOut(uint amountIn, address[] memory path) public view returns (uint[] memory amounts)',
'function swapExactTokensForTokens(uint amountIn, uint amountOutMin, address[] calldata path, address to, uint deadline) external returns (uint[] memory amounts)'
],
account
);
console.log('router');
//console.log(router);
const wbnb = new ethers.Contract(
addresses.WBNB,
[
'function approve(address spender, uint amount) public returns(bool)',
],
account
);
console.log('wbnb');
//console.log(wbnb);
const init = async () => {
/*const tx = await wbnb.approve(
router.address,
'replace by amount covering several trades'
);
const receipt = await tx.wait(); */

console.log('Transaction receipt11');
//console.log(receipt);
}
console.log('PairCreated');

factory.on('error', function(err){
console.log('onerror');
console.log(err);
});

factory.on('PairCreated', async (token0, token1, pairAddress) => {

console.log('on PairCreated');

console.log(New pair detected ================= token0: ${token0} token1: ${token1} pairAddress: ${pairAddress});

//The quote currency needs to be WBNB (we will pay with WBNB)
let tokenIn, tokenOut;
if(token0 === addresses.WBNB) {
tokenIn = token0;
tokenOut = token1;
}

if(token1 == addresses.WBNB) {
tokenIn = token1;
tokenOut = token0;
}

//The quote currency is not WBNB
if(typeof tokenIn === 'undefined') {
return;
}

//We buy for 0.1 BNB of the new token
//ethers was originally created for Ethereum, both also work for BSC
//'ether' === 'bnb' on BSC
const amountIn = ethers.utils.parseUnits('0.01', 'ether');
const amounts = await router.getAmountsOut(amountIn, [tokenIn, tokenOut]);
//Our execution price will be a bit different, we need some flexbility
const amountOutMin = amounts[1].sub(amounts[1].div(10));
console.log(Buying new token ================= tokenIn: ${amountIn.toString()} ${tokenIn} (WBNB) tokenOut: ${amounOutMin.toString()} ${tokenOut});

/* const tx = await router.swapExactTokensForTokens(
amountIn,
amountOutMin,
[tokenIn, tokenOut],
addresses.recipient,
Date.now() + 1000 * 60 * 10 //10 minutes
);

const receipt = await tx.wait();
*/
console.log('Transaction receipt');
console.log(receipt);
});

init();

[thekooldev1232]

You

I have same problem , What can we do?
(node:15408) UnhandledPromiseRejectionWarning: Error: invalid BigNumber string (argument="value", value="replace by amount covering several trades", code=INVALID_ARGUMENT, version=bignumber/5.0.15)

You need to replace "replace by amount covering several trades" with value, put "1" or more.
Anyway after solving this one, I got "tx.wait() is not function" and solve this, but can see he solve it too yesterday. After that we need to figure out how to solve gas estimate error. I think it should work with this, not sure, but it worked with Uniswap.

We need to set gas price and limit manual.

const tx = await router.swapExactTokensForTokens(
    amountIn,
    amountOutMin,
    [tokenIn, tokenOut],
    addresses.recipient,
    {
      value: '0',
      gasPrice: ethers.BigNumber.from(1000000).toHexString(),
      gasLimit: ethers.BigNumber.from(1000000).toHexString() 
    },
    Date.now() + 1000 * 60 * 10, // 10 minutes
); 

this doesn't work dude! still issue persist

[agoralive]

Really looking forward to hopefully fixing this issue guys :)

[thekooldev1232]

add nounce inside the tx object

[ivekivek]

add nounce inside the tx object

It is working like that?

[agoralive]

@thekooldev1232

Code example?

[tuxforensics]

// i added the line below this comment to solve my issues for the approve.
const valueToapprove = ethers.utils.parseUnits('0.05', 'ether');
const init = async () => {
const tx = await wbnb.approve(
router.address,
valueToapprove
// valueToapprove is the constant before this block
);

Now I need help with setting gas limit and gas because estimation isn't working and i don't know where to put them for the transaction

[hbtj123]

Hi All,
I have something similar.

Can anyone advise here?

transaction failed (transactionHash="", transaction={"nonce":,"gasPrice":{"type":"BigNumber","hex":""},"gasLimit":{"type":"BigNumber","hex":"0x061a80"},"to":"","value":{"type":"BigNumber","hex":"0x00"},"data":"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","chainId":56,"v":148,"r":"","s":"","from":"","hash":""}, receipt={"to":"","from":"","contractAddress":null,"transactionIndex":324,"gasUsed":{"type":"BigNumber","hex":"0x5a8b"},"logsBloom":"0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000","blockHash":"0x2ee5c5c282a605193f282aa34e31fa18c62ff3fdc6cd996e1592be49cdb60e03","transactionHash":"0x35bb3f987f4f99fab4572db341886220a400f791cb68bce401dcf00fd5099396","logs":[],"blockNumber":7663738,"confirmations":1,"cumulativeGasUsed":{"type":"BigNumber","hex":"0x02bf7565"},"status":0,"byzantium":true}, code=CALL_EXCEPTION, version=providers/5.0.24)
at Logger.makeError (\trading-bot\node_modules@ethersproject\logger\lib\index.js:180:21)
at Logger.throwError (\trading-bot\node_modules@ethersproject\logger\lib\index.js:189:20)
at WebSocketProvider. (\trading-bot\node_modules@ethersproject\providers\lib\base-provider.js:1162:36)

[mestan998]

Hey After Fixing all the above issues I am getting error

Unexpected server response: 200
Emitted 'error' event on WebSocket instance at:
at abortHandshake (/home/shady/Projects/Tokens/PancakeBot/node_modules/ws/lib/websocket.js:698:15)
at ClientRequest. (/home/shady/Projects/Tokens/PancakeBot/node_modules/ws/lib/websocket.js:580:7)
[... lines matching original stack trace ...]

[henrykash]

Okay, so I got this error because if this line
https://github.com/jklepatch/eattheblocks/blob/master/screencast/348-pancakeswap-trading-bot/bot.js#L41
I had to use '1' or larger amount on approve. But now I get this error instead:

(node:21550) UnhandledPromiseRejectionWarning: TypeError: tx.wait is not a function
    at init (/home/pancake-trading-bot/bot.js:44:28)
    at process._tickCallback (internal/process/next_tick.js:68:7)
(node:21550) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). (rejection id: 1)
(node:21550) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.

Which I dont understand either because wbnb.approve returns bool so tx = true, there is no function called wait

I already solved my previous problem above, but I got this error

UnhandledPromiseRejectionWarning: Error: cannot estimate gas; transaction may fail or may require manual gas limit (error={"reason":"cannot estimate gas; transaction may fail or may require manual gas limit","code":"UNPREDICTABLE_GAS_LIMIT"

you can try hardcode the gasLimit it will solve the issue

const tx = await wbnb.approve(
router.address,
valueToapprove,
{
gasLimit:100000
}
);

[henrykash]

you can try hardcode the gasLimit

[GianluBLockchain-DEV]

same here

Hey After Fixing all the above issues I am getting error

Unexpected server response: 200 Emitted 'error' event on WebSocket instance at: at abortHandshake (/home/shady/Projects/Tokens/PancakeBot/node_modules/ws/lib/websocket.js:698:15) at ClientRequest. (/home/shady/Projects/Tokens/PancakeBot/node_modules/ws/lib/websocket.js:580:7) [... lines matching original stack trace ...]

i have same error how did you fix this?

[SloboZjalic]

Hehe got it all sorted now

…

On Sat, 12 Nov 2022, 3:15 am Henry Kariuki Nyagah, ***@***.***> wrote: Okay, so I got this error because if this line https://github.com/jklepatch/eattheblocks/blob/master/screencast/348-pancakeswap-trading-bot/bot.js#L41 I had to use '1' or larger amount on approve. But now I get this error instead: (node:21550) UnhandledPromiseRejectionWarning: TypeError: tx.wait is not a function at init (/home/pancake-trading-bot/bot.js:44:28) at process._tickCallback (internal/process/next_tick.js:68:7) (node:21550) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). (rejection id: 1) (node:21550) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code. Which I dont understand either because wbnb.approve returns bool so tx = true, there is no function called wait I already solved my previous problem above, but I got this error UnhandledPromiseRejectionWarning: Error: cannot estimate gas; transaction may fail or may require manual gas limit (error={"reason":"cannot estimate gas; transaction may fail or may require manual gas limit","code":"UNPREDICTABLE_GAS_LIMIT" you can try hardcode the gasLimit it will solve the issue const tx = await wbnb.approve( router.address, valueToapprove, { gasLimit:100000 } ); — Reply to this email directly, view it on GitHub <#58 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ATGNCO443IWD5F3P7NCJARLWHZWLPANCNFSM443IC7LQ> . You are receiving this because you are subscribed to this thread.Message ID: ***@***.***>

[henrykash]

Did you get through the blocker? On Mon, Nov 21, 2022 at 5:58 AM SloboZjalic ***@***.***> wrote:

…

Hehe got it all sorted now On Sat, 12 Nov 2022, 3:15 am Henry Kariuki Nyagah, ***@***.***> wrote: > Okay, so I got this error because if this line > > https://github.com/jklepatch/eattheblocks/blob/master/screencast/348-pancakeswap-trading-bot/bot.js#L41 > I had to use '1' or larger amount on approve. But now I get this error > instead: > > (node:21550) UnhandledPromiseRejectionWarning: TypeError: tx.wait is not a function > at init (/home/pancake-trading-bot/bot.js:44:28) > at process._tickCallback (internal/process/next_tick.js:68:7) > (node:21550) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). (rejection id: 1) > (node:21550) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code. > > Which I dont understand either because wbnb.approve returns bool so tx = > true, there is no function called wait > > I already solved my previous problem above, but I got this error > > UnhandledPromiseRejectionWarning: Error: cannot estimate gas; transaction may fail or may require manual gas limit (error={"reason":"cannot estimate gas; transaction may fail or may require manual gas limit","code":"UNPREDICTABLE_GAS_LIMIT" > > you can try hardcode the gasLimit it will solve the issue > > const tx = await wbnb.approve( > router.address, > valueToapprove, > { > gasLimit:100000 > } > ); > > — > Reply to this email directly, view it on GitHub > < #58 (comment) >, > or unsubscribe > < https://github.com/notifications/unsubscribe-auth/ATGNCO443IWD5F3P7NCJARLWHZWLPANCNFSM443IC7LQ > > . > You are receiving this because you are subscribed to this thread.Message > ID: ***@***.***> > — Reply to this email directly, view it on GitHub <#58 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AJLLIIYJAH6G3I6EHTBLJQ3WJLQONANCNFSM443IC7LQ> . You are receiving this because you commented.Message ID: ***@***.***>

[SloboZjalic]

All the errors are there

…

On Sat, 12 Nov 2022, 3:15 am Henry Kariuki Nyagah, ***@***.***> wrote: Okay, so I got this error because if this line https://github.com/jklepatch/eattheblocks/blob/master/screencast/348-pancakeswap-trading-bot/bot.js#L41 I had to use '1' or larger amount on approve. But now I get this error instead: (node:21550) UnhandledPromiseRejectionWarning: TypeError: tx.wait is not a function at init (/home/pancake-trading-bot/bot.js:44:28) at process._tickCallback (internal/process/next_tick.js:68:7) (node:21550) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). (rejection id: 1) (node:21550) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code. Which I dont understand either because wbnb.approve returns bool so tx = true, there is no function called wait I already solved my previous problem above, but I got this error UnhandledPromiseRejectionWarning: Error: cannot estimate gas; transaction may fail or may require manual gas limit (error={"reason":"cannot estimate gas; transaction may fail or may require manual gas limit","code":"UNPREDICTABLE_GAS_LIMIT" you can try hardcode the gasLimit it will solve the issue const tx = await wbnb.approve( router.address, valueToapprove, { gasLimit:100000 } ); — Reply to this email directly, view it on GitHub <#58 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ATGNCO443IWD5F3P7NCJARLWHZWLPANCNFSM443IC7LQ> . You are receiving this because you are subscribed to this thread.Message ID: ***@***.***>

[henrykash]

Ok, I will check. On Mon, Nov 21, 2022 at 12:13 PM SloboZjalic ***@***.***> wrote:

…

All the errors are there On Sat, 12 Nov 2022, 3:15 am Henry Kariuki Nyagah, ***@***.***> wrote: > Okay, so I got this error because if this line > > https://github.com/jklepatch/eattheblocks/blob/master/screencast/348-pancakeswap-trading-bot/bot.js#L41 > I had to use '1' or larger amount on approve. But now I get this error > instead: > > (node:21550) UnhandledPromiseRejectionWarning: TypeError: tx.wait is not a function > at init (/home/pancake-trading-bot/bot.js:44:28) > at process._tickCallback (internal/process/next_tick.js:68:7) > (node:21550) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). (rejection id: 1) > (node:21550) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code. > > Which I dont understand either because wbnb.approve returns bool so tx = > true, there is no function called wait > > I already solved my previous problem above, but I got this error > > UnhandledPromiseRejectionWarning: Error: cannot estimate gas; transaction may fail or may require manual gas limit (error={"reason":"cannot estimate gas; transaction may fail or may require manual gas limit","code":"UNPREDICTABLE_GAS_LIMIT" > > you can try hardcode the gasLimit it will solve the issue > > const tx = await wbnb.approve( > router.address, > valueToapprove, > { > gasLimit:100000 > } > ); > > — > Reply to this email directly, view it on GitHub > < #58 (comment) >, > or unsubscribe > < https://github.com/notifications/unsubscribe-auth/ATGNCO443IWD5F3P7NCJARLWHZWLPANCNFSM443IC7LQ > > . > You are receiving this because you are subscribed to this thread.Message > ID: ***@***.***> > — Reply to this email directly, view it on GitHub <#58 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AJLLII5HSBJRCFHMMQQHKC3WJM4MRANCNFSM443IC7LQ> . You are receiving this because you commented.Message ID: ***@***.***>

[henrykash]

Alright so instead of using wait( ) function you can use the waitForTransaction function from ethers, which takes in the transaction hash of the transaction broadcasted , number of confirmation and timeout in milliseconds ...assuming that the tx returns a successful transaction hash and that it's accessed as tx.data : you can do the following example

const tx = await wbnb.approve(
router.address,
valueToapprove,
{
gasLimit:100000
}
);
const provider = new ethers.providers.WebSocketProvider('wss://apis.ankr.com/wss/....');
const receipt =  await  provider.waitForTransaction(tx.data, 1, 60000);

  if (receipt && receipt.status == 1) {

           //TODO: you can proceed with your code execution                                                   
    })