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This bug was originally marked as duplicate of bug 236789, that is already resolved. This bug is still valid, so this seems to be another bug, but it might be related. Build: NetBeans IDE Dev (Build 201703060002) VM: Java HotSpot(TM) 64-Bit Server VM, 25.102-b14, Java(TM) SE Runtime Environment, 1.8.0_102-b14 OS: Windows 10 User Comments: wissenstein: Edited Formatting section for a project and tried to save it. Stacktrace: java.lang.IllegalStateException: Node has been removed. at java.util.prefs.AbstractPreferences.get(AbstractPreferences.java:283) at org.netbeans.modules.projectapi.AuxiliaryConfigBasedPreferencesProvider$AuxiliaryConfigBasedPreferences.access$1901(AuxiliaryConfigBasedPreferencesProvider.java:447) at org.netbeans.modules.projectapi.AuxiliaryConfigBasedPreferencesProvider$AuxiliaryConfigBasedPreferences$2.run(AuxiliaryConfigBasedPreferencesProvider.java:676) at org.netbeans.modules.projectapi.AuxiliaryConfigBasedPreferencesProvider$AuxiliaryConfigBasedPreferences$2.run(AuxiliaryConfigBasedPreferencesProvider.java:674) at org.netbeans.modules.openide.util.DefaultMutexImplementation.readAccess(DefaultMutexImplementation.java:209) at org.openide.util.Mutex.readAccess(Mutex.java:250)
Created attachment 163919 [details] stacktrace