title: Unable to register extension org.sonar.plugins.scala.cobertura.CoberturaSensor
body: <p>I am using SonarQube 5.1 and its running on localhost. It was working out of box for java, but when i added the plugin for scala - <a href="http://docs.codehaus.org/display/SONAR/Scala+Plugin" rel="nofollow">http://docs.codehaus.org/display/SONAR/Scala+Plugin</a> (i checked out the code from github, build the jar and then installed in sonarqube installation), now every time i invoke the gradle command sonarRunner - I am getting this error:</p>
  
  <pre><code>19:52:55.232 [ERROR] [system.err] ERROR: Unable to execute Sonar
  19:52:55.233 [ERROR] [system.err] ERROR: Caused by: Unable to register extension org.sonar.plugins.scala.cobertura.CoberturaSensor
  19:52:55.233 [ERROR] [system.err] ERROR: Caused by: org/sonar/plugins/cobertura/api/AbstractCoberturaParser
  19:52:55.233 [ERROR] [system.err] ERROR: Caused by: org.sonar.plugins.cobertura.api.AbstractCoberturaParser
  </code></pre>
  
  <p>I tried searching for cause of the issue but could not find anything online. Please help me.</p>