%swf = ('file' => new Fl ('Myflash.swf'), 'url' => $url);

Use Data::Dumper to inspect the contents of the %swf hash. My guess is that it contains an odd number of elements, just like the warning message states. diagnostics can give you a little more detailed explanation of the message. Perhaps the new call returns something unexpected.

Are you sure HoneyClient::Agent::Driver::ActiveContent::Flash even works? The CPAN Testers report no passing tests.