title: The Findbugs configuration file is not valid Error While uploading rule file to sonarQube
body: <p>I have an issue when creating a new profile in sonarqube-4.1.2. Here is at I did:</p>
  
  <ol>
  <li>I have sonar 3.1 rt now, that has 461 rules. Did a back up and saved the rule files containing rules for checkstyle. pmd and findbug.</li>
  <li>I did try to create a new profile by clicking on "Create" in 4.1.2. It give me error 
  <code>The Findbugs configuration file is not valid : profile : profile   [hide]</code></li>
  <li>I also tried to Restore Profile which also is not importing the right number of rules. restoring only 345 rules.</li>
  </ol>
  
  <p>In the log I see this error:</p>
  
  <pre><code>ERROR [o.s.p.f.FindbugsProfileImporter]  The Findbugs configuration file is not valid
  com.thoughtworks.xstream.mapper.CannotResolveClassException: profile : profile
          at com.thoughtworks.xstream.mapper.DefaultMapper.realClass(DefaultMapper.java:68) ~[xstream-1.3.1.jar:na]
  </code></pre>
  
  <p>Please suggest what can be done to fix this.</p>