title: eclipse plugin fails to load org.eclipse.pde.ui:Disabled
body: <p>My plugin fails to be loaded in eclipse in ubuntu environment with following message</p>
  
  <pre><code>The following problems were found:
    The bundle is disabled: "org.eclipse.pde.ui:Disabled via PDE"
    Missing host JavaSE_0.0.0
  </code></pre>
  
  <p>The available JREs on the system are 1.7, 1.6 .</p>
  
  <p>Can anyboday give a hint why this happens ? And how this can be solved ? </p>
  
  <p>On Windows machine everything works well.</p>
  
  <hr>
  
  <p><strong>UPDATE</strong> : PDE Error log shows following</p>
  
  <p>eclipse.buildId=M20130204-1200 java.version=1.6.0_24 java.vendor=Sun Microsystems Inc. BootLoader constants: OS=linux, ARCH=x86, WS=gtk, NL=en_US Command-line arguments:  -os linux -ws gtk -arch x86  Error Tue Jun 04 10:33:19 CEST 2013 FrameworkEvent ERROR  org.osgi.framework.BundleException: The bundle "com.example.Enum2String_1.0.1 [303]" could not be resolved. Reason: The bundle is disabled: "org.eclipse.pde.ui:Disabled via PDE"     at org.eclipse.osgi.framework.internal.core.AbstractBundle.getResolverError(AbstractBundle.java:1332)   at org.eclipse.osgi.framework.internal.core.AbstractBundle.getResolutionFailureException(AbstractBundle.java:1316)  at org.eclipse.osgi.framework.internal.core.BundleHost.startWorker(BundleHost.java:323)     at org.eclipse.osgi.framework.internal.core.AbstractBundle.resume(AbstractBundle.java:390)  at org.eclipse.osgi.framework.internal.core.Framework.resumeBundle(Framework.java:1176)     at org.eclipse.osgi.framework.internal.core.StartLevelManager.resumeBundles(StartLevelManager.java:559)     at org.eclipse.osgi.framework.internal.core.StartLevelManager.resumeBundles(StartLevelManager.java:544)     at org.eclipse.osgi.framework.internal.core.StartLevelManager.incFWSL(StartLevelManager.java:457)   at org.eclipse.osgi.framework.internal.core.StartLevelManager.doSetStartLevel(StartLevelManager.java:243)   at org.eclipse.osgi.framework.internal.core.StartLevelManager.dispatchEvent(StartLevelManager.java:438)     at org.eclipse.osgi.framework.internal.core.StartLevelManager.dispatchEvent(StartLevelManager.java:1)   at org.eclipse.osgi.framework.eventmgr.EventManager.dispatchEvent(EventManager.java:230)    at org.eclipse.osgi.framework.eventmgr.EventManager$EventThread.run(EventManager.java:340)</p>