title: Eclipse RCP : Application "org.eclipse.ui.ide.workbench" could not be found in the registry
body: <p>I am new to Eclipse RCP. I am trying to set up a RCP project on Eclipse Juno.<br>
  After importing all the plugins into my workspace, I get the following error trying to run the application:</p>
  
  <pre><code>java.lang.RuntimeException: Application "org.eclipse.ui.ide.workbench" could not be found in the registry. The applications available are: org.eclipse.ant.core.antRunner, org.eclipse.e4.ui.workbench.swt.E4Application, org.eclipse.e4.ui.workbench.swt.GenTopic, org.eclipse.emf.mwe.core.WorkflowRunner, org.eclipse.equinox.app.error.
      at org.eclipse.equinox.internal.app.EclipseAppContainer.startDefaultApp(EclipseAppContainer.java:248)
      at org.eclipse.equinox.internal.app.MainApplicationLauncher.run(MainApplicationLauncher.java:29)
      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:354)
      at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:181)
      at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
      at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
      at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
      at java.lang.reflect.Method.invoke(Method.java:597)
      at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:636)
      at org.eclipse.equinox.launcher.Main.basicRun(Main.java:591)
      at org.eclipse.equinox.launcher.Main.run(Main.java:1450)
      at org.eclipse.equinox.launcher.Main.main(Main.java:1426)
  </code></pre>
  
  <p>May I know how to resolve this error?</p>