Urgent!! unusual error on front page

[adham]

Hi!
I have VM 2.0.8e joomla 2.5 (latest).
I get this error in the shopping cart modul
Warning: unserialize() [function.unserialize]: Function spl_autoload_call() hasn't defined the class it was called for in ........ components/com_virtuemart/helpers/cart.php on line 93
But only on front page other pages it works fine??

Update: If I publish another (Duplicate)cart modul the 2nd one works fine???

[adham]

Hmmm nobody? at ALL!