Let's decompose the error message...
Undefined Subroutine &main::get called at Webcrawler.pl line 38, <STDIN> line 1.
- <STDIN> line 1
- One line has been read from STDIN. (which is true at line 38)
- at Webcrawler.pl line 38
- The problem is in the file 'Webcrawler.pl' on line 38.
- Undefined Subroutine &main::get called
- You attempted to call the function 'get' in the 'main' (default) namespace, but the function wasn't defined.
So ... looking at line 38:
$webcrawler = get($url_name);
You're attempting to assign to the scalar $webcrawler the returned value from get($url_name)
More than likely, what you wanted to do was to call the 'get' method on $webcrawler, which is a WWW::Mechanize object:
$webcrawler->get($url_name);
Of course, from looking at the documentation from WWW::Mechanize, you'd see that get returns an HTTP::Response object, which you'll most likely want to assign to something, so you can interact with it.
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