Error when upgragrade to php5

[Hanoifishing]

Hi all!

I'm trying to upgrade my php to version5. But my vbb is error when reply new post.
Fatal error: Using $this when not in object context in D:\***\forum\newreply.php(1066) : eval()'d code on line 9

Please help me to fix it.

Thanks!

[Dismounted]

This is caused by a modification - disable each in turn until you find the culprit.