My text ui project give an exception after the plug in is started. The scoping class is implemented. There are only two txt files ion xtext project when running the PDE
!ENTRY org.eclipse.oomph.setup.ui 2 0 2016-10-11 21:53:35.798
!MESSAGE java.lang.NullPointerException
!STACK 0
java.lang.NullPointerException
at org.eclipse.oomph.setup.ui.SetupUIPlugin.performStartup(SetupUIPlugin.java:373)
at org.eclipse.oomph.setup.ui.SetupUIPlugin.access$4(SetupUIPlugin.java:344)
at org.eclipse.oomph.setup.ui.SetupUIPlugin$1$1.run(SetupUIPlugin.java:241)
at org.eclipse.core.internal.jobs.Worker.run(Worker.java:55)
How can I track down the error?
According to the exception trace, the error is caused by the Oomph installer trying to execute some startup tasks, and thus unrelated to your plug-in being developed or Xtext.
In order to solve the issue, I have two ideas: