panic: runtime error: invalid memory address or nil pointer dereference

[rocketlaunchr]

panic: runtime error: invalid memory address or nil pointer dereference

[pjebs]

@propersam can you look at this

[pjebs]

@kaviarasankk

After this line: df, err := imports.LoadFromCSV(ctx, bytes.NewReader(content))
Can you check err. If err != nil, then don't proceed.

[pjebs]

This line is also wrong:

var writers io.Writer
jsonErr := exports.ExportToJSON(ctx, writers, df)

writers is nil. It needs to actually be something.

[kaviarasankk]

           `content, err := coreio.ReadFile(parsedDirectory, file.Name())
	if err != nil{
		fmt.Println(err)
		return
	}

	df, err := imports.LoadFromCSV(ctx, bytes.NewReader(content))
	if err != nil{
		fmt.Println(err)
		log.Fatal(err)
	}

	var writers io.Writer
	jsonErr := exports.ExportToJSON(ctx, writers, df)
	if jsonErr != nil{
		fmt.Println("Json export error")
	}`

Tried the above code still the issue persist

[pjebs]

writers is nil. That's why it's panicing.

[propersam]

Hi @kaviarasankk you need to implement Writer properly..

update:
when you use the ExportToJSON method..you are expected to pass a pointer containing file location that the result will be written to..and that is why your 'writer' is supposed to be a pointer to an open file. but instead your writer is empty. Hence the error. so io.writer is not properly implemented
..
or you can try this other method i use..if you like..(if it makes sense in your context)

import "os"

// create/open a file using os.OpenFile
file, err := os.OpenFile("result.json", os.O_CREATE|os.O_WRONLY, 0777) // creates the file if it doesn't exist
if err != nil {
    fmt.Println(err)
}
defer file.Close()

// Then pass your 'file' into the ExportToJSON method
if err := exports.ExportToJSON(ctx, file, df); err != nil {
    fmt.Println(err)
}