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java.lang.NullPointerException: 	at com.google.gwt.dev.jjs.impl.TypeReferencesRecorder.processMethodCall(TypeReferencesRecorder.java:188)	at com.google.gwt.dev.jjs.impl.TypeReferencesRecorder.endVisit(TypeReferencesRecorder.java:96)	at com.google.gwt.dev.jjs.ast.JMethodCall.traverse(JMethodCall.java:268)	at com.google.gwt.dev.jjs.ast.JVisitor.accept(JVisitor.java:127)	at com.google.gwt.dev.jjs.ast.JVisitor.accept(JVisitor.java:122)	at com.google.gwt.dev.jjs.ast.JVisitor.accept(JVisitor.java:118)	at com.google.gwt.dev.jjs.ast.JExpressionStatement.traverse(JExpressionStatement.java:42)	at com.google.gwt.dev.jjs.ast.JVisitor.accept(JVisitor.java:146)	at com.google.gwt.dev.jjs.ast.JVisitor.acceptWithInsertRemove(JVisitor.java:168)	at com.google.gwt.dev.jjs.ast.JBlock.traverse(JBlock.java:92)	at com.google.gwt.dev.jjs.ast.JVisitor.accept(JVisitor.java:127)	at com.google.gwt.dev.jjs.ast.JVisitor.accept(JVisitor.java:139)	at com.google.gwt.dev.jjs.ast.JVisitor.accept(JVisitor.java:135)	at com.google.gwt.dev.jjs.ast.JMethodBody.traverse(JMethodBody.java:83)	at com.google.gwt.dev.jjs.ast.JVisitor.accept(JVisitor.java:127)	at com.google.gwt.dev.jjs.ast.JVisitor.accept(JVisitor.java:122)	at com.google.gwt.dev.jjs.ast.JMethod.visitChildren(JMethod.java:785)	at com.google.gwt.dev.jjs.ast.JMethod.traverse(JMethod.java:777)	at com.google.gwt.dev.jjs.ast.JVisitor.accept(JVisitor.java:146)	at com.google.gwt.dev.jjs.ast.JVisitor.acceptWithInsertRemoveImmutable(JVisitor.java:172)	at com.google.gwt.dev.jjs.ast.JClassType.traverse(JClassType.java:147)	at com.google.gwt.dev.jjs.ast.JVisitor.accept(JVisitor.java:127)	at com.google.gwt.dev.jjs.ast.JVisitor.accept(JVisitor.java:122)	at com.google.gwt.dev.jjs.ast.JProgram.visitModuleTypes(JProgram.java:1284)	at com.google.gwt.dev.jjs.ast.JProgram.traverse(JProgram.java:1249)	at com.google.gwt.dev.jjs.ast.JVisitor.accept(JVisitor.java:127)	at com.google.gwt.dev.jjs.ast.JVisitor.accept(JVisitor.java:122)	at com.google.gwt.dev.jjs.impl.TypeReferencesRecorder.execImpl(TypeReferencesRecorder.java:151)	at com.google.gwt.dev.jjs.impl.TypeReferencesRecorder.exec(TypeReferencesRecorder.java:46)	at com.google.gwt.dev.jjs.JavaToJavaScriptCompiler.maybeRecordReferencesAndControlFlow(JavaToJavaScriptCompiler.java:473)	at com.google.gwt.dev.jjs.JavaToJavaScriptCompiler.compilePermutation(JavaToJavaScriptCompiler.java:352)	at com.google.gwt.dev.jjs.JavaToJavaScriptCompiler.compilePermutation(JavaToJavaScriptCompiler.java:272)	at com.google.gwt.dev.CompilePerms.compile(CompilePerms.java:198)	at com.google.gwt.dev.ThreadedPermutationWorkerFactory$ThreadedPermutationWorker.compile(ThreadedPermutationWorkerFactory.java:50)	at com.google.gwt.dev.PermutationWorkerFactory$Manager$WorkerThread.run(PermutationWorkerFactory.java:74)	at java.lang.Thread.run(Thread.java:745)