Please explain the error message

Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException: component
argument pData
at sun.awt.windows.Win32SurfaceData.initOps(Native Method)
at sun.awt.windows.Win32SurfaceData.<init>(Win32SurfaceData.java:448)
at sun.awt.windows.Win32SurfaceData.createData(Win32SurfaceData.java:316
at sun.awt.Win32GraphicsConfig.createSurfaceData(Win32GraphicsConfig.jav
a:357)
at sun.awt.windows.WComponentPeer.replaceSurfaceData(WComponentPeer.java
:332)
at sun.awt.windows.WComponentPeer.replaceSurfaceData(WComponentPeer.java
:313)
at sun.awt.windows.WComponentPeer$2.run(WComponentPeer.java:353)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:461)
at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchTh
read.java:242)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThre
ad.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)

Briefly, your program has a bug.
More specifically, it appears that the Abstract Window Toolkit, in trying to respond to an event, encountered a pointer that was set to null, rather than pointing at some data. You probably failed to initialize the pointer when setting up whatever you were trying to use the AWT for.
Posting your code (inside code tags) may help someone here help you find the bug.

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