Hi there, I'm also facing the same problem as the topic stater.
When I add two line like suggested above

@responses = $response_tree->children();
print @responses;


I get the folowing error:
\Global symbol "@responses" requires explicit package name at ./test_grep.pl line 20.
Global symbol "$response_tree" requires explicit package name at ./test_grep.pl line 20.
Global symbol "@responses" requires explicit package name at ./test_grep.pl line 21.
Execution of ./test_grep.pl aborted due to compilation errors.

Which package name should I use?

When I print $response->content;
I also get the response that my browser doesn't support frames....
the URL is http://www.dewestonline.cq-link.sr/

Thanks in advance
Albert