Plesk Fatal Error

[imscorp]

When I try to log into my control panel, I get this error:
ERROR: PleskFatalException
Unable to create Session object: session_set_save_handler() failed:

0: C:\Program Files\SWsoft\Plesk\admin\plib\common_func.php3:152
psaerror(string 'Unable to create Session object: session_set_save_handler() failed: ')
1: C:\Program Files\SWsoft\Plesk\admin\auto_prepend\auth.php3:127

Any suggestions?