"I think the method is a part of WWW::Mechanize::TreeBuilder"
It isn't. Show the code you're actually running, because nothing provided here does what you claim.
"The project I am working on is a Web based application that uses Real time Perl WebFramework-> mojolicious."
The code I gave you uses Mojo::DOM, part of Mojolicious. Previously I asked you to read How do I post a question effectively?. The best way to get help is show an example of the code you are actually running, the input (in this case some HTML), the output you get and the output you want. This approach requires effort from you but is quicker than others trying to guess what you may be doing.
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