Default Signature Error

[Madspot]

Fatal error: Using $this when not in object context in /home/unlimite/public_html/admincp/usergroup.php(337) : eval()'d code on line 1

this is vbhackers default sig and when i got to edit the usergroups to put the image i click save gives me that error
can someone tell me the problem

[Opserty]

Disable your modifications and then post on the board/thread where you downloaded the modification from for further assistance with the problem.