in reply to Not a subroutine reference
Can you post more of your code please? You have an error on demandbuild-hotel.pl line 8, probably on that line you use Modules::CheckCCRfiles; right? If not, can you post demandbuild-hotel.pl line 1 through 10 here? Put line 8 in bold if possible.
Then, what is going on on Modules/CheckCCRfiles.pm line 6? Can we see that code? Your _load_constants method, is it from Modules/CheckCCRfiles.pm?
And Modules/Util is a CPAN module right? Do you know which version you have?
There are no stupid questions, but there are a lot of inquisitive idiots.