[LaLindsey]

Originally Posted by garg

Hi,

Which version of PHP are you using? You can find the version by going to
http://[yourpliggurl.com]/info.php

where [yourpliggurl] is the domain you've installed pligg on.

If your PHP is below version 4 then you'll have to upgrade php because mb_strtolower is (PHP 4 >= 4.3.0, PHP 5)

http://www.zend.com/manual/function.mb-strtolower.php

I have version 4.3.10 installed and I am getting the same error. I'll try the workaround KingPin suggested, but just wanted to let you know it's not just limited to 4 and below.