我的文本ui项目在插件启动后发出异常。范围类已实现。运行PDE时,只有两个txt文件离开xtext项目
!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)
如何追踪错误?