~testJSON/script$ CATALYST_ENGINE='HTTP::Prefork' testjson_server.pl Can't locate Catalyst/Engine/HTTP/Prefork.pm in @INC (@INC contains: /home/code-ninja/Projects/Perl/testJSON/script/../lib /etc/perl /usr/local/lib/perl/5.14.2 /usr/local/share/perl/5.14.2 /usr/lib/perl5 /usr/share/perl5 /usr/lib/perl/5.14 /usr/share/perl/5.14 /usr/local/lib/site_perl .) at /usr/local/share/perl/5.14.2/Class/Load.pm line 177. Compilation failed in require at /usr/local/share/perl/5.14.2/Catalyst/ScriptRunner.pm line 50.