java.lang.NullPointerException

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    • java.lang.NullPointerException at java.awt.Container.addImpl(Container.java:1019) at java.awt.Container.add(Container.java:351) at Sys_adm.actionPerformed(product.java:217) at java.awt.MenuItem.processActionEvent(MenuItem.java:597) at java.awt.MenuItem.processEvent(MenuItem.java:556) at java.awt.MenuComponent.dispatchEventImpl(MenuComponent.java:298) at java.awt.MenuComponent.dispatchEvent(MenuComponent.java:286) at java.awt.EventQueue.dispatchEvent(EventQueue.java:466) at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:234) at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:163) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:157) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:149) at java.awt.EventDispatchThread.run(EventDispatchThread.java:110)

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