title: amateras html editor not opening files
body: <p>I am using eclipse STS IDE. Using <a href="http://amateras.sourceforge.jp/cgi-bin/fswiki_en/wiki.cgi?page=EclipseHTMLEditor" rel="nofollow">Amateras HTML editor plugin</a>. I was working fine but after restart, I am not able to restart any files using this editor. I see this error in eclipse log file.</p>
  
  <pre><code>Caused by: java.lang.NoSuchMethodError: org.eclipse.ui.internal.PopupMenuExtender.&lt;init&gt;(Ljava/lang/String;Lorg/eclipse/jface/action/MenuManager;Lorg/eclipse/jface/viewers/ISelectionProvider;Lorg/eclipse/ui/IWorkbenchPart;)V
                  at tk.eclipse.plugin.htmleditor.editors.SplitPageHTMLEditor$SplitEditorSite.registerContextMenu(SplitPageHTMLEditor.java:234)
                  at tk.eclipse.plugin.htmleditor.editors.SplitPageHTMLEditor$SplitEditorSite.registerContextMenu(SplitPageHTMLEditor.java:282)
                  at org.eclipse.ui.texteditor.AbstractTextEditor.createPartControl(AbstractTextEditor.java:3521)
                  at org.eclipse.ui.texteditor.StatusTextEditor.createPartControl(StatusTextEditor.java:54)
                  at org.eclipse.ui.texteditor.AbstractDecoratedTextEditor.createPartControl(AbstractDecoratedTextEditor.java:447)
                  at tk.eclipse.plugin.htmleditor.editors.HTMLSourceEditor.createPartControl(HTMLSourceEditor.java:162)
                  at tk.eclipse.plugin.htmleditor.editors.SplitPageHTMLEditor.createPartControl(SplitPageHTMLEditor.java:131)
                  at tk.eclipse.plugin.htmleditor.editors.HTMLEditor.createPartControl(HTMLEditor.java:128)
                  at org.eclipse.ui.internal.e4.compatibility.CompatibilityPart.createPartControl(CompatibilityPart.java:142)
                  at org.eclipse.ui.internal.e4.compatibility.CompatibilityEditor.createPartControl(CompatibilityEditor.java:96)
                  at org.eclipse.ui.internal.e4.compatibility.CompatibilityPart.create(CompatibilityPart.java:323)
                  at sun.reflect.GeneratedMethodAccessor85.invoke(Unknown Source)
                  at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
                  at java.lang.reflect.Method.invoke(Method.java:606)
                  at org.eclipse.e4.core.internal.di.MethodRequestor.execute(MethodRequestor.java:56)
                  ... 95 more
  </code></pre>
  
  <p>I restarted eclipse multiple times but still not working. Whats wrong? Is there any cache to clear ?</p>