Thread:Project:Support desk/Getting an error message whenever I try to edit a page/reply (2)

controlEditAccess is called from a hook, so it's most probably a problem with one of the extensions installed in your MediaWiki. Please be sure that you have downloaded the version of every extension that matches the version of your MediaWiki installation, otherwise incompatibilities like this may arise.

You can identify what extension is responsible for that error by disabling (removing/commenting its reference in LocalSettings.php) all extensions and enabling one by one until you reproduce the problem again.