credentials(), afaict, takes 4 parameters, not two.

Later versions also do support two parameters. From the Changes file: 

1.20   Sat Aug 19 09:09:08 EDT 2006

        [ENHANCEMENTS]
        * Added new two-argument form of credentials() method.
          $mech->credentials($username, $password);
          That provides simpler visiting of password-protected
          resources in the vast majority of cases and still
          allows the other cases to be supported. (Peter Scott)

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In reply to Re^4: Better Solution To WWW::Mechanize Basic Authentication by almut
in thread Better Solution To WWW::Mechanize Basic Authentication by Limbic~Region

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