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I got the same problem when installing.

Perhaps a new version of PHP? I have no idea, I am no PHP-
coder.... ;-)

This was posted 4 months ago, but if anyone still is haveing
this problem, here we go...

This is how I fixed it in main.php:

Look for:

require($cfg->langdir . "lang." . $usr_langcode . ".php");

Insert this simple line before:

if($usr_langcode == "") $usr_langcode = "en";
require($cfg->langdir . "lang." . $usr_langcode . ".php");

Worked for me.