FastCGI problem

i am using vbSEO 3.0.0 and vBulletin 3.6.7PL1

When i enable FastCGI and after clicked a thread or post links following error occur

(when i disable fastCGI everythings are ok )

Code:

Moved Permanently

 The document has moved here. 
Additionally, a 500 Internal Server Error error was encountered while trying to use an ErrorDocument to handle the request. 
 Apache/1.3.37 Server at www.vbseo.com Port 80

i talked about this problem with hosting support team . They said me "it is about vbSEO"

Hello,

PM sent.