Wed May 30 08:51:59 CEST 2001: java.lang.IllegalArgumentException: Cannot have 
null root context.
java.lang.IllegalArgumentException: Cannot have null root context.
    at org.openide.explorer.ExplorerManager.setRootContext
(ExplorerManager.java:333)
    at org.netbeans.modules.debugger.support.nodes.DebuggerView.createView
(DebuggerView.java:244)
    at org.netbeans.modules.debugger.support.nodes.DebuggerView.addNotify
(DebuggerView.java:201)
    at java.awt.Container.addImpl(Container.java:374)
    at javax.swing.JTabbedPane.insertTab(JTabbedPane.java:445)
    at javax.swing.JTabbedPane.addTab(JTabbedPane.java:480)
    at org.netbeans.core.windows.frames.SplitContainerImpl.attachComponents
(SplitContainerImpl.java:185)
    at org.netbeans.core.windows.frames.DefaultContainerImpl.setAttached
(DefaultContainerImpl.java:416)
    at org.netbeans.core.windows.ModeImpl.setVisible(ModeImpl.java:617)
    at org.netbeans.core.windows.ModeImpl$1.performCommand(ModeImpl.java:283)
    at org.netbeans.core.windows.DeferredPerformer.processCommand
(DeferredPerformer.java:165)
    at org.netbeans.core.windows.DeferredPerformer.putRequest
(DeferredPerformer.java:83)
    at org.netbeans.core.windows.ModeImpl.dockInto(ModeImpl.java:262)
    at org.netbeans.core.windows.ModeImpl.dockInto(ModeImpl.java:246)
    at org.netbeans.core.windows.WindowManagerImpl$TopComponentManager.doOpen
(WindowManagerImpl.java:1101)
    at org.netbeans.core.windows.WindowManagerImpl$TopComponentManager.open
(WindowManagerImpl.java:1062)
    at org.openide.windows.TopComponent.open(TopComponent.java:192)
    at org.openide.explorer.ExplorerPanel.open(ExplorerPanel.java:81)
    at org.netbeans.modules.debugger.support.nodes.DebuggerView.open
(DebuggerView.java:175)
    at org.netbeans.core.windows.ModeImpl.performCommand(ModeImpl.java:1214)
    at org.netbeans.core.windows.DeferredPerformer.processCommand
(DeferredPerformer.java:165)
    at org.netbeans.core.windows.DeferredPerformer.stateChanged
(DeferredPerformer.java:136)
    at org.netbeans.core.windows.StateManager.fireStateChanged
(StateManager.java:117)
    at org.netbeans.core.windows.StateManager.setVisibilityState
(StateManager.java:142)
    at org.netbeans.core.windows.StateManager.propertyChange
(StateManager.java:164)
    at java.beans.PropertyChangeSupport.firePropertyChange
(PropertyChangeSupport.java:230)
    at java.beans.PropertyChangeSupport.firePropertyChange
(PropertyChangeSupport.java:157)
    at java.awt.Component.firePropertyChange(Component.java:4471)
    at org.netbeans.core.windows.MainWindow.doShowWindow(MainWindow.java:218)
    at org.netbeans.core.windows.MainWindow.access$300(MainWindow.java:57)
    at org.netbeans.core.windows.MainWindow$4.run(MainWindow.java:202)
    at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:154)
[catch] at java.awt.EventQueue.dispatchEvent(EventQueue.java:337)
    at java.awt.EventDispatchThread.pumpOneEventForHierarchy
(EventDispatchThread.java:131)
    at java.awt.EventDispatchThread.pumpEventsForHierarchy
(EventDispatchThread.java:98)
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
    at java.awt.EventDispatchThread.run(EventDispatchThread.java:85)


During start of the ide appears this Exception and the startup wont finish. The 
Splash-Screen disappears and the ide screen wont come up, but in the runide.exe 
process is still active and wont finish.

I have to delete the project.last file do bring the ide up again.

I use the SDI-Interface, a switch back to MDI wont help.

I dont know how, but i can't see the source-view in the debugger and cant 
reactivate it, i think this is the problem.