Unable to load the requested language file 'users/users' for current lang...

Hi all,

I have a standalone script which is now ok for Xenforo (SSO) but I get this message when browsing to the plugin URL:

An Error Was Encountered
Unable to load the requested language file 'users/users' for current language 'English' AND for fallback to 'English'.

I'm totally blocked at this step...

Thanks for your help.

This code is present inside the file config.php but it doesn't work...

$config['language'] = 'English';