how to solve this => Fatal error: Class 'cache' not found i

[Guest amida]

What does this mean and what to change?

Fatal error: Class 'cache' not found in ../../includes/functions.inc.php on line 1018

on that line it shows this:

$cache = new cache('config.'.$confName);

anybody know what to do or is there a file missing in the Cache folder as there is only a index.php file in it.

thanks

David