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java.lang.IllegalArgumentException: im == null!	at javax.imageio.ImageIO.write(Unknown Source)	at javax.imageio.ImageIO.write(Unknown Source)	at undefined.Main.main(	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)	at java.lang.reflect.Method.invoke(Unknown Source)	at edu.rice.cs.drjava.model.compiler.JavacCompiler.runCommand(