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via Stack Overflow by ZephyrWolf
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java.lang.IllegalArgumentException: adding a window to a container	at java.awt.Container.checkNotAWindow(Unknown Source)	at java.awt.Container.addImpl(Unknown Source)	at java.awt.Container.add(Unknown Source)	at javax.swing.JFrame.addImpl(Unknown Source)	at java.awt.Container.add(Unknown Source)	at grape2run.main(grape2run.java:9)