title: NullPointerException in SetupUIPlugin.performStartup()
body: <p>I developed a plug-in project using elipse and it was working fine as expected. I then exported this project as an archive file and imported it to a new workspace. On executing the project is the new workspace I get the below null-pointer exception. There have been few posts on such kind of errors in eclipse forums, but I could not find anything concrete. Please let me know if you have faced such an issue before.</p>
  
  <blockquote>
    <p>!ENTRY org.eclipse.oomph.setup.ui 2 0 2017-04-10 22:11:10.525<br />
    !MESSAGE java.lang.NullPointerException<br />
    !STACK 0<br />
    java.lang.NullPointerException
        at org.eclipse.oomph.setup.ui.SetupUIPlugin.performStartup(SetupUIPlugin.java:443)<br />
        at org.eclipse.oomph.setup.ui.SetupUIPlugin.access$5(SetupUIPlugin.java:414)<br />
        at org.eclipse.oomph.setup.ui.SetupUIPlugin$1$1.run(SetupUIPlugin.java:253)<br />
        at org.eclipse.core.internal.jobs.Worker.run(Worker.java:55)</p>
  </blockquote>