Error including the required files:

Be sure you uploaded UltBB.setup, Styles.file, mods.file and forums.cgi in ASCII/Text mode to your CGI directory. [This is a manual setting on your FTP software]

Make sure spelling and case are correct: UltBB.setup not ultbb.setup.

Here is the message returned from UBB:

Can't locate UltBB.setup in @INC (@INC contains: /usr/local/lib64/perl5/5.32 /usr/local/share/perl5/5.32 /usr/lib64/perl5/vendor_perl /usr/share/perl5/vendor_perl /usr/lib64/perl5 /usr/share/perl5) at cpanel.cgi line 38.