Getting NullPointerException while trying to compile widget

Hello everyone

at first sorry for my bad englisch… :slight_smile:

After I installed the Vaadin Plug-in for Eclipse version 2.3.1.201411271550 in my eclipse Luna I tried to
compile my Vaadin widgetset. But then I got this error message: (attachment)

I checked my workspace log and found the following entry:

!ENTRY com.vaadin.integration.eclipse 4 0 2015-02-03 10:30:35.521
!MESSAGE Widgetset compilation failed
!STACK 0
java.lang.NullPointerException
at com.vaadin.integration.eclipse.builder.WidgetsetBuildManager.compileWidgetset(WidgetsetBuildManager.java:637)
at com.vaadin.integration.eclipse.handlers.CompileWidgetsetHandler.compileFile(CompileWidgetsetHandler.java:152)
at com.vaadin.integration.eclipse.handlers.CompileWidgetsetHandler$1.run(CompileWidgetsetHandler.java:86)
at org.eclipse.core.internal.jobs.Worker.run(Worker.java:54)

Can someone tell me what went wrong?

Best regards

Steffen

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