title: Not able to open .groovy files in Groovy Editor in GGTS 3.4.0
body: <p>In GGTS 3.4.0, i am not able to open .groovy files using groovy editor. My .project has the following natures added</p>
  
  <pre><code>&lt;natures&gt;
      &lt;nature&gt;org.grails.ide.eclipse.core.nature&lt;/nature&gt;
      &lt;nature&gt;org.eclipse.jdt.groovy.core.groovyNature&lt;/nature&gt;
      &lt;nature&gt;org.eclipse.jdt.core.javanature&lt;/nature&gt;
      &lt;nature&gt;org.eclipse.wst.common.project.facet.core.nature&lt;/nature&gt;
  &lt;/natures&gt;
  </code></pre>
  
  <p>One error which i get on saving any groovy file is:
  Errors occurred during the build.
  Errors running builder 'Java Builder' on project 'ml-app'.
  org/codehaus/jdt/groovy/integration/LanguageSupportFactory </p>
  
  <p>Any help in resolving this error and being able to use groovy editor is appreciated.</p>