MyBB 1.8.37 Error 500 "PHP Fatal error: Cannot redeclare error()"

[KamillaPup]

MyBB 1.8.37 Error 500 "PHP Fatal error: Cannot redeclare error()"

[dvz]

Are there more details for this or any other errors?

If you open MyBB's main directory (rather than /install), does it also result in a 500 error?

This may be caused by another scripts incorrectly loaded before/after MyBB in the server configuration.

[KamillaPup]

That's all I have. This is a fresh install and I'm going to /install. Also the config.php file is 0 bytes. Is that by design?

[dvz]

Also the config.php file is 0 bytes. Is that by design?

Yes, it's populated during installation.

This is a fresh install and I'm going to /install.

If it's redirecting there from the main directory, it may be specific to the installation (otherwise, MyBB or the server).

It's not an usual error, so it's likely related to the server.

You can create a new test.php file, upload it, and access it to generate some information:

<?php

// included files diagnostics
var_dump(
	get_included_files()
);

// function definition diagnostics
$name = 'error';

$methods = [
	'getFileName',
	'getNamespaceName',
	'getStartLine',
	'getEndLine',
	'getExtension',
	'isInternal',
];

if (function_exists($name)) {
	$reflection = new ReflectionFunction($name);
	
	$data = [];
	
	foreach ($methods as $method) {
		$data[$method] = $reflection->$method();
	}
	
	var_dump($data);
} else {
	echo "Function {$name} is not defined";
}

and paste the output here.

[KamillaPup]

array(1) { [0]=> string(59) "/var/www/vhosts/example.com/httpdocs/install/test.php" } array(6) { ["getFileName"]=> bool(false) ["getNamespaceName"]=> string(0) "" ["getStartLine"]=> bool(false) ["getEndLine"]=> bool(false) ["getExtension"]=> object(ReflectionExtension)#2 (1) { ["name"]=> string(11) "kolabformat" } ["isInternal"]=> bool(true) }

[dvz]

Looks like an extension kolabformat adds a function with a conflicting name - see if you can disable it for the server where MyBB is supposed to be run.

[KamillaPup]

That was it! I went into the Plesk extensions, disabled Plesk Premium Email by Kolab, and it worked.

Although I was using that extension. Would there be anyway to get them to work together?

[dvz]

Keeping MyBB's function renamed would be difficult, so it may be best to reach out to the provider/Plesk/extension maintainers about addressing the underlying issue, or creating separate configurations for the mail-related software.

Apparently relevant issue: https://git.kolab.org/T5746