title: xml.etree.ElementTree.ParseError: not well-formed (invalid token) in Python
body: <p>I am trying to open an XML file using <code>ElementTree</code> but an error occurred: </p>
  
  <blockquote>
    <p>xml.etree.ElementTree.ParseError: not well-formed (invalid token)</p>
  </blockquote>
  
  <p>And here is my code:</p>
  
  <pre><code># -*- coding: utf-8 -*-
  import xml.etree.ElementTree as etree
  
  def main():
      tree = etree.parse('test.xml')
      print 'parsing Success!'
  
  if __name__ == "__main__":
      main()
  </code></pre>
  
  <p>How can I fix this error?</p>