java.lang.NullPointerException
   at org.netbeans.modules.bpel.validation.variable.Validator$1.checkContent(Validator.java:462)
   at org.netbeans.modules.bpel.validation.variable.Validator$1.checkTo(Validator.java:377)
   at org.netbeans.modules.bpel.validation.variable.Validator$1.checkCopies(Validator.java:370)
   at org.netbeans.modules.bpel.validation.variable.Validator$1.visit(Validator.java:362)
   at org.netbeans.modules.bpel.model.impl.AssignImpl.accept(AssignImpl.java:160)
   at org.netbeans.modules.bpel.model.impl.BpelEntityImpl.accept(BpelEntityImpl.java:222)
   at org.netbeans.modules.bpel.model.impl.BpelEntityImpl.acceptChildren(BpelEntityImpl.java:335)
   at org.netbeans.modules.bpel.model.impl.BpelEntityImpl.accept(BpelEntityImpl.java:223)
   at org.netbeans.modules.bpel.model.impl.BpelEntityImpl.acceptChildren(BpelEntityImpl.java:335)
   at org.netbeans.modules.bpel.model.impl.BpelEntityImpl.accept(BpelEntityImpl.java:223)
   at org.netbeans.modules.bpel.validation.core.BpelValidator$1.run(BpelValidator.java:102)
   at org.netbeans.modules.bpel.model.impl.BpelModelImpl.invoke(BpelModelImpl.java:250)
   at org.netbeans.modules.bpel.validation.core.BpelValidator.validate(BpelValidator.java:106)
   at org.netbeans.modules.xml.xam.spi.Validation.validate(Validation.java:95)
   at org.netbeans.modules.xml.validation.ValidationOutputWindowController.validate(ValidationOutputWindowController.java:89)
   at org.netbeans.modules.xml.validation.ValidationOutputWindowController.validate(ValidationOutputWindowController.java:74)
   at org.netbeans.modules.xml.validation.ValidateAction$RunAction.run(ValidateAction.java:121)
   at org.netbeans.modules.soa.validation.core.Controller.doValidation(Controller.java:215)
   at org.netbeans.modules.soa.validation.core.Controller.startValidation(Controller.java:117)
   at org.netbeans.modules.soa.validation.action.ValidationAction.actionPerformed(ValidationAction.java:60)
   at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2028)
   at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2351)
   at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:387)
   at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:242)
   at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:236)
   at java.awt.AWTEventMulticaster.mouseReleased(AWTEventMulticaster.java:272)
   at java.awt.Component.processMouseEvent(Component.java:6348)
   at javax.swing.JComponent.processMouseEvent(JComponent.java:3267)
   at java.awt.Component.processEvent(Component.java:6113)
   at java.awt.Container.processEvent(Container.java:2085)
   at java.awt.Component.dispatchEventImpl(Component.java:4714)
   at java.awt.Container.dispatchEventImpl(Container.java:2143)
   at java.awt.Component.dispatchEvent(Component.java:4544)
   at java.awt.LightweightDispatcher.retargetMouseEvent(LightweightDispatcher.java:4618)
   at java.awt.LightweightDispatcher.processMouseEvent(LightweightDispatcher.java:4282)
   at java.awt.LightweightDispatcher.dispatchEvent(LightweightDispatcher.java:4212)
   at java.awt.Container.dispatchEventImpl(Container.java:2129)
   at java.awt.Window.dispatchEventImpl(Window.java:2478)
   at java.awt.Component.dispatchEvent(Component.java:4544)
   at java.awt.EventQueue.dispatchEvent(EventQueue.java:635)
   at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:125)
   at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:296)
   at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:211)
   at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:201)
   at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:196)
   at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:188)
   at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)