title: mechanize._mechanize.LinkNotFoundError
body: <p>I try to imitate a link click using this script:</p>
  
  <pre><code>#!/usr/bin/env python
  
  import mechanize
  
  targetPage = 'http://example.com/'
  clickUrl="http://someurlinsideexample.com/" 
  
  br = mechanize.Browser(factory=mechanize.RobustFactory())
  br.open(targetUrl)
  br.follow_link(url=clickUrl)
  </code></pre>
  
  <p>but I get this error:</p>
  
  <pre><code>  File "/usr/local/lib/python2.7/dist-packages/mechanize-0.2.5-py2.7.egg/mechanize/_mechanize.py", line 620, in find_link
      raise LinkNotFoundError()
  mechanize._mechanize.LinkNotFoundError
  </code></pre>
  
  <p>What's wrong with my snippet and how to fix it?</p>