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I remove the group from the R4E preferences, then I press OK. The group did not disappear from the R4E navigator view. So, I select it to open, the I got the following error, but the group open anyway java.lang.NullPointerException at org.eclipse.mylyn.reviews.r4e.ui.internal.navigator.ReviewNavigatorView.preferenceChange(ReviewNavigatorView.java:639) at org.eclipse.core.internal.preferences.EclipsePreferences$2.run(EclipsePreferences.java:754) at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42) at org.eclipse.core.internal.preferences.EclipsePreferences.firePreferenceEvent(EclipsePreferences.java:757) at org.eclipse.core.internal.preferences.EclipsePreferences.put(EclipsePreferences.java:770) at org.eclipse.ui.preferences.ScopedPreferenceStore.setValue(ScopedPreferenceStore.java:789)
This problem is fixed in the current release 0.9.0 as of 31-03-2012