From the Changelog: 

1.52        Tue Nov 25 09:52:30 CST 2008
========================================
[FIXED]
Improved some error messages in $mech->submit_form().  Thanks to
Norbert Buchmuller.

[download]

In reply to Re: WWW::Mechanize version differences with confess by jbt
in thread WWW::Mechanize version differences with confess by Ineffectual

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