java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.TextView.setText(java.lang.CharSequence)' on a null object reference

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Attempt to invoke virtual method 'void android.widget.TextView.setText(java.lang.CharSequence)' on a null object reference
java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.TextView.setText(java.lang.CharSequence)' on a null object reference
at android.example.com.sevens.GameActivity$MyDragListener.onDrag(GameActivity.java:413)
at android.view.View.dispatchDragEvent(View.java:19809)
at android.view.ViewGroup.dispatchDragEvent(ViewGroup.java:1423)
at android.view.ViewGroup.dispatchDragEvent(ViewGroup.java:1423)
at android.view.ViewGroup.dispatchDragEvent(ViewGroup.java:1423)
at android.view.ViewGroup.dispatchDragEvent(ViewGroup.java:1423)
at android.view.ViewGroup.dispatchDragEvent(ViewGroup.java:1423)
at android.view.ViewGroup.dispatchDragEvent(ViewGroup.java:1423)
at android.view.ViewRootImpl.handleDragEvent(ViewRootImpl.java:5488)
at android.view.ViewRootImpl.access$1000(ViewRootImpl.java:108)
at android.view.ViewRootImpl$ViewRootHandler.handleMessage(ViewRootImpl.java:3624)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:168)
at android.app.ActivityThread.main(ActivityThread.java:5845)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:797)

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