I installed UBB6.02 in my website, but when I try to go to ultimatebb.cgi it says this:

Software error:
Execution of /usr/home/okayz/htdocs/cgi-bin/ubbcgi/ultimatebb.cgi aborted due to compilation errors.
For help, please send mail to the webmaster (webmaster@okayz.net), giving this error message and the time and date of the error.

Is that a CGI problem or it's the server?

Try
http://www.okayz.net/cgi-bin/ubbcgi/ultimatebb.cgi

<FONT COLOR="#000000" SIZE="1">[ May 28, 2001 11:14 PM: Message edited by: Gabx ]</font>

things aren't probably where they should be . try it again . and check the permissions that they too are correct

I get the following error when trying the link you provided:

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try installing 6.04e instead of 6.02.