Fatal error: Class 'Controllersalecustomergroup' not found

Hi all,

I can't access customer groups, I get this error.

Fatal error: Class 'Controllersalecustomergroup' not found in /home/********/public_html/vqmod/vqcache/vq2-system_engine_front.php on line 39

Also for customers I get this error:
Fatal error: require_once() [<a href='function.require-once'>function.require-once</a>]: Cannot redeclare class controllercommonhome in /home/******/public_html/vqmod/vqcache/vq2-system_engine_front.php on line 35

For coupons I get this error:
Fatal error: Class 'Controllersalecoupon' not found in /home/*****/public_html/vqmod/vqcache/vq2-system_engine_front.php on line 39

Does anyone know why they aren't working?