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Build: NetBeans IDE Dev (Build 20121008-5c87dd7d5cc2) VM: Java HotSpot(TM) 64-Bit Server VM, 23.3-b01, Java(TM) SE Runtime Environment, 1.7.0_07-b11 OS: Windows 7 Stacktrace: java.lang.InstantiationException: org.netbeans.modules.web.javascript.debugger.actions.DebuggerActionsProvider at java.lang.Class.newInstance0(Class.java:357) at java.lang.Class.newInstance(Class.java:325) at org.netbeans.spi.debugger.ContextAwareSupport.createInstance(ContextAwareSupport.java:137) at org.netbeans.spi.debugger.ActionsProvider$ContextAware.getDelegate(ActionsProvider.java:218) at org.netbeans.spi.debugger.ActionsProvider$ContextAware.getActions(ActionsProvider.java:241) at org.netbeans.api.debugger.ActionsManager.registerActionsProviders(ActionsManager.java:482)
Created attachment 125608 [details] stacktrace
It's apparent, that you've installed some modules, but more detailed steps would help. Were you just starting or stopping run of an HTML5 file?
There are no new reports, when it reappears, please add steps to reproduce...