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java.lang.IllegalArgumentException: im == null! at javax.imageio.ImageIO.write(Unknown Source) at javax.imageio.ImageIO.write(Unknown Source) at 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(