Error including required files: Can't locate UltBB.setup in @INC (@INC contains: /usr/local/lib/perl5/site_perl/mach/5.28 /usr/local/lib/perl5/site_perl /usr/local/lib/perl5/5.28/mach /usr/local/lib/perl5/5.28) at ubbmisc.cgi line 39.

Make sure these files exist, permissions are set properly, and paths are set correctly.