Is there a way to know what modules will need to be installed to get the Perl code working? The Perl script that I am working with uses SOAP::Lite and HTTP::Cookies. When I do perl -MSOAP::Lite -le "print(SOAP::Lite-VERSION)" I get the version numbers for both the above modules. So I assume that they are installed fine. I also installed the LWP Bundle but it still throws the same error. fault_code -1 500 Usage: $h->push_header($field, $val) at /opt/perl5/lib/5.8.6/MatcherClient.pm line 347 Thanks