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java.lang.NullPointerException: 	at com.google.gwt.dev.jjs.impl.UnifyAst.addRootTypes(UnifyAst.java:735)	at com.google.gwt.dev.jjs.JavaToJavaScriptCompiler$Precompiler.unifyJavaAst(JavaToJavaScriptCompiler.java:1291)	at com.google.gwt.dev.jjs.JavaToJavaScriptCompiler$Precompiler.constructJavaAst(JavaToJavaScriptCompiler.java:1038)	at com.google.gwt.dev.jjs.JavaToJavaScriptCompiler$Precompiler.precompile(JavaToJavaScriptCompiler.java:954)	at com.google.gwt.dev.jjs.MonolithicJavaToJavaScriptCompiler.precompile(MonolithicJavaToJavaScriptCompiler.java:303)	at com.google.gwt.dev.jjs.JavaScriptCompiler.precompile(JavaScriptCompiler.java:38)	at com.google.gwt.dev.Precompile.precompile(Precompile.java:286)	at com.google.gwt.dev.Precompile.precompile(Precompile.java:229)	at com.google.gwt.dev.Precompile.precompile(Precompile.java:145)	at com.google.gwt.dev.Compiler.run(Compiler.java:206)	at com.google.gwt.dev.codeserver.Recompiler.doCompile(Recompiler.java:333)	at com.google.gwt.dev.codeserver.Recompiler.compile(Recompiler.java:161)	at com.google.gwt.dev.codeserver.Recompiler.recompile(Recompiler.java:119)	at com.google.gwt.dev.codeserver.Outbox.recompile(Outbox.java:128)	at com.google.gwt.dev.codeserver.JobRunner.recompile(JobRunner.java:81)	at com.google.gwt.dev.codeserver.JobRunner.access$100(JobRunner.java:34)	at com.google.gwt.dev.codeserver.JobRunner$2.run(JobRunner.java:73)	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)	at java.util.concurrent.FutureTask.run(FutureTask.java:262)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)	at java.lang.Thread.run(Thread.java:745)