java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at oracle.ewt.lwAWT.LWComponent.addNotify(Unknown Source)
at java.awt.Container.addNotify(Unknown Source)
at java.awt.Window.addNotify(Unknown Source)
at java.awt.Dialog.addNotify(Unknown Source)
at java.awt.Dialog.conditionalShow(Unknown Source)
at java.awt.Dialog.show(Unknown Source)
at java.awt.Component.show(Unknown Source)
at java.awt.Component.setVisible(Unknown Source)
at oracle.forms.demos.uploadclient.FileUploaderProgressBar.setVisible(FileUploaderProgressBar.java:136)
at oracle.forms.demos.uploadclient.FileUploader.loadFile(FileUploader.java:357)
at oracle.forms.demos.uploadclient.FileUploaderLoadThread.run(FileUploaderLoadThread.java:40)

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