issue after installed vBSEO,

hello,
I got this error in my forum when i click on any url ,
Object not found!
The requested URL was not found on this server. The link on the referring page seems to be wrong or outdated. Please inform the author of that page about the error.

If you think this is a server error, please contact the webmaster.

Error 404
Apache/2.0.54 (Debian GNU/Linux) mod_auth_pgsql/2.0.2b1 mod_ssl/2.0.54 OpenSSL/0.9.7e

if i delete the vBSEO is working well,

Hello Charley ,

I can't see a licensed defined for your nickname. If you purchased vBSEO please PM me your forum adress and payment transaction id.