title: Android development - 'missing theme error' in eclipse ide for layout xml files
body: <p>I have recently installed Eclipse IDE for Java Developers (Version: 3.6.1) with the Android SDK Platform 2.1update1 - on Windows 7.</p>
  
  <p>I can add, edit and run code for projects, however, in the Workbench area the Graphical Layout view of the layout xml files always shows a "missing theme" message in bottom right navigation area.The left Palette navigator area is ok and the remaining area is blank.</p>
  
  <p>The error message reads: "Selecting page '0' in AndroidXmlEditor failed"</p>
  
  <pre><code>The first and last 10 lines from the Exception Stack Trace reads:
  java.lang.NullPointerException
  at com.android.ide.eclipse.adt.internal.editors.layout.gle2.Gra phicalEditorPart.renderWithBridge(Unknown Source)
  at com.android.ide.eclipse.adt.internal.editors.layout.gle2.Gra phicalEditorPart.recomputeLayout(Unknown Source)
  at com.android.ide.eclipse.adt.internal.editors.layout.gle2.Gra phicalEditorPart.activated(Unknown Source)
  at com.android.ide.eclipse.adt.internal.editors.layout.LayoutEd itor.pageChange(Unknown Source)
  at org.eclipse.ui.part.MultiPageEditorPart.setActivePage(MultiP ageEditorPart.java:1067)
  at org.eclipse.ui.forms.editor.FormEditor.setActivePage(FormEdi tor.java:607)
  at com.android.ide.eclipse.adt.internal.editors.AndroidXmlEdito r.selectDefaultPage(Unknown Source)
  at com.android.ide.eclipse.adt.internal.editors.AndroidXmlEdito r.addPages(Unknown Source)
  at org.eclipse.ui.forms.editor.FormEditor.createPages(FormEdito r.java:138)
  at org.eclipse.ui.part.MultiPageEditorPart.createPartControl(Mu ltiPageEditorPart.java:348)
  
  at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher .start(EclipseAppLauncher.java:79)
  at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseS tarter.java:369)
  at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseS tarter.java:179)
  at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
  at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
  at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
  at java.lang.reflect.Method.invoke(Unknown Source)
  at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java: 619)
  at org.eclipse.equinox.launcher.Main.basicRun(Main.java:574)
  at org.eclipse.equinox.launcher.Main.run(Main.java:1407)
  </code></pre>
  
  <p>Thanks for your help in advance.</p>