I keep getting this error and I can't figure out why. Can anybody point me in the right direction?

i take it youre running the port with nuke, right? if thats the case, that means there is not a theme in the nuke theme folder and a theme in the forum folder with the same name. the program will not change one and not the other.

for example: say you want phpIB2 for your site theme. download the theme pack from here (nukemods). upload the files given into the html folder. the directory structure is retained, so dont worry where to put everything. just drag it to your main FTP directory. make sure that both the forum theme and the nuke theme uploaded correctly ( html/modules/Forums/templates/phpIB2 and html/themes/phpIB2 )

if that was confusing, just let me know.

You also have to add the style in your forum admin cp.

OK, I found the right place in the phpBB control panel.