Admin site page error after installing vqmod

Hello,

I have successfully installed vqmod (from vqmod.com). But the admin site page become inaccessible with following error messages:
-------------------------------------------------------
Notice: Undefined index: token in /home/mysite.com/admin/controller/error/not_found.php on line 16Notice: Undefined index: token in /home/mysite.com/admin/controller/error/not_found.php on line 21

Fatal error: Call to a member function getUserName() on null in /home/mysite.com/admin/controller/common/header.php on line 41
-----------------------------------------------------
I appreciate qphoria and jay6390 provided me lot of advises and confirmed vqmod already installed. I still need to fix the above problem now. I tested when I remove vqmod then the site back to normal.

I hope someone have same problem before can help me.

Thanks in advance!

Hi,

Be sure you donwloaded last version of vqmod.

Have you modified core files?

I changed to other VQMOD extension. So far everything looks good now.

Thank you!