Verify that the module is installed: Run this from the commandline...it'll print "ok" if the module is installed and complain about not finding the module if it's not.

perl -MNet::FTP -e"print 'ok'"
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If the module is, in fact, installed....Are you sure the exact identical script works on the other machine? Are the versions of Perl the same? (use perl -v to find the version)...And if all of that is fine please post your code.