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spoon.compiler.ModelBuildingException: The type $ is already defined	at spoon.support.compiler.jdt.JDTBasedSpoonCompiler.reportProblem(JDTBasedSpoonCompiler.java:391)	at spoon.support.compiler.jdt.TreeBuilderRequestor.acceptResult(TreeBuilderRequestor.java:21)	at spoon.support.compiler.jdt.TreeBuilderCompiler.buildUnits(TreeBuilderCompiler.java:56)	at spoon.support.compiler.jdt.JDTBatchCompiler.getUnits(JDTBatchCompiler.java:121)	at spoon.support.compiler.jdt.JDTBasedSpoonCompiler.buildSources(JDTBasedSpoonCompiler.java:222)	at spoon.support.compiler.jdt.JDTBasedSpoonCompiler.build(JDTBasedSpoonCompiler.java:480)	at spoon.Launcher.buildModel(Launcher.java:664)	at spoon.Launcher.run(Launcher.java:616)	at com.devfactory.runner.SpoonClassLoader.load(SpoonClassLoader.java:24)	at com.devfactory.runner.WeakTestRunner.main(WeakTestRunner.java:164)