Any advice on that? Use of undefined constant assumed 'WPLANG' in…. /wp-content/plugin

Hi there,

just wondering if one of you could give us a hint how to deal with the following error message as we are not familiar at all with .php or any other programming knowledge.

Message is

Use of undefined constant WPLANG – assumed ‘WPLANG’ in …. v2/public_html/wp-content/plugins/directory/core/custompress/core/core.php on line 57

Appreciate your professional advice to this.

Thanks in advance


  • Vaughan
    • Support/SLS MockingJay

    Hi Prinz,

    Are you using multilanguages at all?

    Can you open up wp-config.php in an editor such as notepad++

    Usually wp-config.php resides in your servers public_html folder (but could be different depending on the server)

    Make sure the following line is present in the file, if it isn’t simply add it.

    define('WPLANG', '');

    Hope this helps

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