java.lang.IllegalArgumentException: adding a window to a container

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java.lang.IllegalArgumentException: adding a window to a container	at java.awt.Container.addImpl(Container.java:1061)	at java.awt.Container.add(Container.java:377)	at JFrameInAContainerTest.main(JFrameInAContainerTest.java:11)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:616)	at edu.rice.cs.drjava.model.compiler.JavacCompiler.runCommand(JavacCompiler.java:271)