title: Eclipse Android SDK - error in building workspace
body: <p>I have updated my packages using Android SDK Manager and clicked on Help > Check for updates and updated installed plug-ins. I was prompted to restart eclipse, and now after restarting, </p>
  
  <p>I get following Error code</p>
  
  <pre><code>'Building workspace' has encountered a problem.
  Errors occurred during the build
  
  Errors occurred during the build.
  Error instantiating builder 'com.android.ide.eclipse.adt.ResourceManagerBuilder'.
  Plug-in com.android.ide.eclipse.adt was unable to load class com.android.ide.eclipse.adt.internal.build.builders.ResourceManagerBuilder.
  Bad version number in .class file
  Plug-in com.android.ide.eclipse.adt was unable to load class com.android.ide.eclipse.adt.internal.build.builders.ResourceManagerBuilder.
  Bad version number in .class file
  Error instantiating builder 'com.android.ide.eclipse.adt.PreCompilerBuilder'.
  Plug-in com.android.ide.eclipse.adt was unable to load class com.android.ide.eclipse.adt.internal.build.builders.PreCompilerBuilder.
  Bad version number in .class file
  Plug-in com.android.ide.eclipse.adt was unable to load class com.android.ide.eclipse.adt.internal.build.builders.PreCompilerBuilder.
  Bad version number in .class file
  Error instantiating builder 'com.android.ide.eclipse.adt.ApkBuilder'.
  Plug-in com.android.ide.eclipse.adt was unable to load class com.android.ide.eclipse.adt.internal.build.builders.PostCompilerBuilder.
  Bad version number in .class file
  Plug-in com.android.ide.eclipse.adt was unable to load class com.android.ide.eclipse.adt.internal.build.builders.PostCompilerBuilder.
  Bad version number in .class file
  Error instantiating builder 'com.android.ide.eclipse.adt.ResourceManagerBuilder'.
  Plug-in com.android.ide.eclipse.adt was unable to load class com.android.ide.eclipse.adt.internal.build.builders.ResourceManagerBuilder.
  Bad version number in .class file
  Plug-in com.android.ide.eclipse.adt was unable to load class com.android.ide.eclipse.adt.internal.build.builders.ResourceManagerBuilder.
  Bad version number in .class file
  Error instantiating builder 'com.android.ide.eclipse.adt.PreCompilerBuilder'.
  Plug-in com.android.ide.eclipse.adt was unable to load class com.android.ide.eclipse.adt.internal.build.builders.PreCompilerBuilder.
  Bad version number in .class file
  Plug-in com.android.ide.eclipse.adt was unable to load class com.android.ide.eclipse.adt.internal.build.builders.PreCompilerBuilder.
  Bad version number in .class file
  Error instantiating builder 'com.android.ide.eclipse.adt.ApkBuilder'.
  Plug-in com.android.ide.eclipse.adt was unable to load class com.android.ide.eclipse.adt.internal.build.builders.PostCompilerBuilder.
  Bad version number in .class file
  Plug-in com.android.ide.eclipse.adt was unable to load class com.android.ide.eclipse.adt.internal.build.builders.PostCompilerBuilder.
  Bad version number in .class file
  Error instantiating builder 'com.android.ide.eclipse.adt.ResourceManagerBuilder'.
  Plug-in com.android.ide.eclipse.adt was unable to load class com.android.ide.eclipse.adt.internal.build.builders.ResourceManagerBuilder.
  Bad version number in .class file
  Plug-in com.android.ide.eclipse.adt was unable to load class com.android.ide.eclipse.adt.internal.build.builders.ResourceManagerBuilder.
  Bad version number in .class file
  Error instantiating builder 'com.android.ide.eclipse.adt.PreCompilerBuilder'.
  Plug-in com.android.ide.eclipse.adt was unable to load class com.android.ide.eclipse.adt.internal.build.builders.PreCompilerBuilder.
  Bad version number in .class file
  Plug-in com.android.ide.eclipse.adt was unable to load class com.android.ide.eclipse.adt.internal.build.builders.PreCompilerBuilder.
  Bad version number in .class file
  Error instantiating builder 'com.android.ide.eclipse.adt.ApkBuilder'.
  Plug-in com.android.ide.eclipse.adt was unable to load class com.android.ide.eclipse.adt.internal.build.builders.PostCompilerBuilder.
  Bad version number in .class file
  Plug-in com.android.ide.eclipse.adt was unable to load class com.android.ide.eclipse.adt.internal.build.builders.PostCompilerBuilder.
  Bad version number in .class file
  Error instantiating builder 'com.android.ide.eclipse.adt.ResourceManagerBuilder'.
  Plug-in com.android.ide.eclipse.adt was unable to load class com.android.ide.eclipse.adt.internal.build.builders.ResourceManagerBuilder.
  Bad version number in .class file
  Plug-in com.android.ide.eclipse.adt was unable to load class com.android.ide.eclipse.adt.internal.build.builders.ResourceManagerBuilder.
  Bad version number in .class file
  Error instantiating builder 'com.android.ide.eclipse.adt.PreCompilerBuilder'.
  Plug-in com.android.ide.eclipse.adt was unable to load class com.android.ide.eclipse.adt.internal.build.builders.PreCompilerBuilder.
  Bad version number in .class file
  Plug-in com.android.ide.eclipse.adt was unable to load class com.android.ide.eclipse.adt.internal.build.builders.PreCompilerBuilder.
  Bad version number in .class file
  Error instantiating builder 'com.android.ide.eclipse.adt.ApkBuilder'.
  Plug-in com.android.ide.eclipse.adt was unable to load class com.android.ide.eclipse.adt.internal.build.builders.PostCompilerBuilder.
  Bad version number in .class file
  Plug-in com.android.ide.eclipse.adt was unable to load class com.android.ide.eclipse.adt.internal.build.builders.PostCompilerBuilder.
  Bad version number in .class file
  Error instantiating builder 'com.android.ide.eclipse.adt.ResourceManagerBuilder'.
  Plug-in com.android.ide.eclipse.adt was unable to load class com.android.ide.eclipse.adt.internal.build.builders.ResourceManagerBuilder.
  Bad version number in .class file
  Plug-in com.android.ide.eclipse.adt was unable to load class com.android.ide.eclipse.adt.internal.build.builders.ResourceManagerBuilder.
  Bad version number in .class file
  Error instantiating builder 'com.android.ide.eclipse.adt.PreCompilerBuilder'.
  Plug-in com.android.ide.eclipse.adt was unable to load class com.android.ide.eclipse.adt.internal.build.builders.PreCompilerBuilder.
  Bad version number in .class file
  Plug-in com.android.ide.eclipse.adt was unable to load class com.android.ide.eclipse.adt.internal.build.builders.PreCompilerBuilder.
  Bad version number in .class file
  Error instantiating builder 'com.android.ide.eclipse.adt.ApkBuilder'.
  Plug-in com.android.ide.eclipse.adt was unable to load class com.android.ide.eclipse.adt.internal.build.builders.PostCompilerBuilder.
  Bad version number in .class file
  Plug-in com.android.ide.eclipse.adt was unable to load class com.android.ide.eclipse.adt.internal.build.builders.PostCompilerBuilder.
  Bad version number in .class file
  Error instantiating builder 'com.android.ide.eclipse.adt.ResourceManagerBuilder'.
  Plug-in com.android.ide.eclipse.adt was unable to load class com.android.ide.eclipse.adt.internal.build.builders.ResourceManagerBuilder.
  Bad version number in .class file
  Plug-in com.android.ide.eclipse.adt was unable to load class com.android.ide.eclipse.adt.internal.build.builders.ResourceManagerBuilder.
  Bad version number in .class file
  Error instantiating builder 'com.android.ide.eclipse.adt.PreCompilerBuilder'.
  Plug-in com.android.ide.eclipse.adt was unable to load class com.android.ide.eclipse.adt.internal.build.builders.PreCompilerBuilder.
  Bad version number in .class file
  Plug-in com.android.ide.eclipse.adt was unable to load class com.android.ide.eclipse.adt.internal.build.builders.PreCompilerBuilder.
  Bad version number in .class file
  Error instantiating builder 'com.android.ide.eclipse.adt.ApkBuilder'.
  Plug-in com.android.ide.eclipse.adt was unable to load class com.android.ide.eclipse.adt.internal.build.builders.PostCompilerBuilder.
  Bad version number in .class file
  Plug-in com.android.ide.eclipse.adt was unable to load class com.android.ide.eclipse.adt.internal.build.builders.PostCompilerBuilder.
  Bad version number in .class file
  Error instantiating builder 'com.android.ide.eclipse.adt.ResourceManagerBuilder'.
  Plug-in com.android.ide.eclipse.adt was unable to load class com.android.ide.eclipse.adt.internal.build.builders.ResourceManagerBuilder.
  Bad version number in .class file
  Plug-in com.android.ide.eclipse.adt was unable to load class com.android.ide.eclipse.adt.internal.build.builders.ResourceManagerBuilder.
  Bad version number in .class file
  Error instantiating builder 'com.android.ide.eclipse.adt.PreCompilerBuilder'.
  Plug-in com.android.ide.eclipse.adt was unable to load class com.android.ide.eclipse.adt.internal.build.builders.PreCompilerBuilder.
  Bad version number in .class file
  Plug-in com.android.ide.eclipse.adt was unable to load class com.android.ide.eclipse.adt.internal.build.builders.PreCompilerBuilder.
  Bad version number in .class file
  Error instantiating builder 'com.android.ide.eclipse.adt.ApkBuilder'.
  Plug-in com.android.ide.eclipse.adt was unable to load class com.android.ide.eclipse.adt.internal.build.builders.PostCompilerBuilder.
  Bad version number in .class file
  Plug-in com.android.ide.eclipse.adt was unable to load class com.android.ide.eclipse.adt.internal.build.builders.PostCompilerBuilder.
  Bad version number in .class file
  </code></pre>