title: Eclipse giving an error of android.support.v7.widget.GridLayout failed to instantiate
body: <p>I have tried to incorporate the GridLayout from the support library, but it is not working. My target build is for API version 10. The XML code I am using is shown below:</p>
  
  <pre><code>    &lt;?xml version="1.0" encoding="UTF-8"?&gt;
      &lt;android.support.v7.widget.GridLayout xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:grid="http://schemas.android.com/apk/res-auto"      
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android.support.v7.widget.columnCount="6" &gt;
   &lt;Button
       android:id="@+id/button1"
       android.support.v7.widget.layout_column="1" 
       android.support.v7.widget.layout_columnSpan="2"
       android.support.v7.widget.layout_gravity="left"
       android.support.v7.widget.layout_row="1"
       android:text="Button" /&gt;
  
   &lt;/android.support.v7.widget.GridLayout&gt;
  </code></pre>
  
  <p>When Eclipse tries to compile this, the error given is: android.support.v7.widget.GridLayout failed to instantiate.  The stack trace is:</p>
  
  <pre><code>    java.lang.NoClassDefFoundError: android/support/v7/gridlayout/R$dimen
  at android.support.v7.widget.GridLayout.&lt;init&gt;(GridLayout.java:255)
  at android.support.v7.widget.GridLayout.&lt;init&gt;(GridLayout.java:274)
  at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
  at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
  at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
  at java.lang.reflect.Constructor.newInstance(Unknown Source)
  at com.android.ide.eclipse.adt.internal.editors.layout.ProjectCallback.instantiateClass(ProjectCallback.java:402)
  at com.android.ide.eclipse.adt.internal.editors.layout.ProjectCallback.loadView(ProjectCallback.java:166)
  at com.android.layoutlib.bridge.android.BridgeInflater.loadCustomView(BridgeInflater.java:205)
  at com.android.layoutlib.bridge.android.BridgeInflater.createViewFromTag(BridgeInflater.java:133)
  at android.view.LayoutInflater.inflate(LayoutInflater.java:386)
  at android.view.LayoutInflater.inflate(LayoutInflater.java:296)
  at com.android.layoutlib.bridge.impl.RenderSessionImpl.inflate(RenderSessionImpl.java:279)
  at com.android.layoutlib.bridge.Bridge.createSession(Bridge.java:318)
  at com.android.ide.common.rendering.LayoutLibrary.createSession(LayoutLibrary.java:325)
  at com.android.ide.eclipse.adt.internal.editors.layout.gle2.RenderService.createRenderSession(RenderService.java:372)
  at com.android.ide.eclipse.adt.internal.editors.layout.gle2.GraphicalEditorPart.renderWithBridge(GraphicalEditorPart.java:1361)
  at com.android.ide.eclipse.adt.internal.editors.layout.gle2.GraphicalEditorPart.recomputeLayout(GraphicalEditorPart.java:1115)
  at com.android.ide.eclipse.adt.internal.editors.layout.gle2.GraphicalEditorPart.activated(GraphicalEditorPart.java:941)
  at com.android.ide.eclipse.adt.internal.editors.layout.LayoutEditorDelegate.delegatePageChange(LayoutEditorDelegate.java:585)
  at com.android.ide.eclipse.adt.internal.editors.common.CommonXmlEditor.pageChange(CommonXmlEditor.java:360)
  at org.eclipse.ui.part.MultiPageEditorPart$2.widgetSelected(MultiPageEditorPart.java:290)
  at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:240)
  at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
  at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1053)
  at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1077)
  at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1062)
  at org.eclipse.swt.widgets.Widget.notifyListeners(Widget.java:774)
  at org.eclipse.swt.custom.CTabFolder.setSelection(CTabFolder.java:2746)
  at org.eclipse.swt.custom.CTabFolder.onMouse(CTabFolder.java:1433)
  at org.eclipse.swt.custom.CTabFolder$1.handleEvent(CTabFolder.java:257)
  at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
  at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1053)
  at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4165)
  at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3754)
  at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2701)
  at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2665)
  at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2499)
  at org.eclipse.ui.internal.Workbench$7.run(Workbench.java:679)
  at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
  at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:668)
  at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)
  at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:123)
  at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196)
  at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:110)
  at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:79)
  at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:344)
  at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.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:622)
  at org.eclipse.equinox.launcher.Main.basicRun(Main.java:577)
  at org.eclipse.equinox.launcher.Main.run(Main.java:1410)
  </code></pre>
  
  <p>Based on the fact that nobody is facing this problem, I suspect that I have not setup the v7 library correctly. The steps I have followed:</p>
  
  <ol>
  <li>Create a library project at the "gridlayout" directory</li>
  <li>Added this project to my Main project</li>
  <li>Added the jar from the gridlayout lib directory to the lib directory of my main project</li>
  </ol>
  
  <p>Any help will be much appreciated.</p>