Check for an error like a missing } " ;
I have not downloaded this one but if there was something you had to edit when installing the hack in that file I would look at the lines you edited because sometimes the error can be thrown down the page like when parentheses is missed. Now a missing ; or " should be on the line stated.
This is in the instructions
If you wish to use a board keyword other than "banners" you can edit the $boardkeyword
variable at the top of the included bannerad.php file.
####
#### Add a config variable
####
In your admin menu, edit the config file.
Scroll to the very bottom, into the box of extra/unknown variables, add this:
$config['banner'] = '';
Did you edit the banner keyword to something else? Did you add the variable above to the admin control panel?
If you edited the variable in the bannerad.php file make sure you have it like this "newname";
