Guestbook and Forum module not working.

[BoiseComputer]

Fatal error: Using $this when not in object context in /usr/local/sitebuilder/modules/guestbook/mod_guestbook.inc on line 172

Fatal error: Using $this when not in object context in /usr/local/sitebuilder/modules/forum/mod_forum.inc on line 151
I am getting the same error while trying to access the Forum Module.

I receive the above errors when I try to execute the sitebuilder module in the sitebuilder wizard. Very strange and annoying.