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This bug was originally marked as duplicate of bug 234518, 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 201512140002) VM: Java HotSpot(TM) 64-Bit Server VM, 25.60-b23, Java(TM) SE Runtime Environment, 1.8.0_60-b27 OS: Linux User Comments: zeloras: Import old modules for python Stacktrace: java.lang.AssertionError: Only once task can be running. Already running : null at org.netbeans.modules.autoupdate.ui.PluginManagerUI.registerRunningTask(PluginManagerUI.java:644) at org.netbeans.modules.autoupdate.ui.wizards.InstallStep$1.propertyChange(InstallStep.java:191) at java.beans.PropertyChangeSupport.fire(PropertyChangeSupport.java:335) at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:327) at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:263) at java.awt.Component.firePropertyChange(Component.java:8430)
Created attachment 157805 [details] stacktrace