java.lang.NoClassDefFoundError: Could not initialize class java.awt.dnd.DragSource
   at org.netbeans.core.ui.warmup.DnDWarmUpTask.run(DnDWarmUpTask.java:62)
   at org.netbeans.core.WarmUpSupport.run(WarmUpSupport.java:90)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1418)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:1960)
Caused: org.openide.util.RequestProcessor$SlowItem: task failed due to: java.lang.NoClassDefFoundError: Could not initialize class java.awt.dnd.DragSource
   at org.openide.util.RequestProcessor.post(RequestProcessor.java:432)
   at org.netbeans.core.WarmUpSupport.warmUp(WarmUpSupport.java:74)
   at org.netbeans.core.GuiRunLevel$2$1.componentShown(GuiRunLevel.java:176)
   at java.awt.Component.processComponentEvent(Component.java:6099)
   at java.awt.Component.processEvent(Component.java:6047)
   at java.awt.Container.processEvent(Container.java:2041)
   at java.awt.Window.processEvent(Window.java:1836)
   at java.awt.Component.dispatchEventImpl(Component.java:4630)
   at java.awt.Container.dispatchEventImpl(Container.java:2099)
   at java.awt.Window.dispatchEventImpl(Window.java:2478)
   at java.awt.Component.dispatchEvent(Component.java:4460)
   at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)
   at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:138)
   at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
   at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
   at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)
   at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)
   at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)
   at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)