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java.lang.AbstractMethodError: org.apache.xerces.dom.ElementNSImpl.setUserData(Ljava/lang/String;Ljava/lang/Object;Lorg/w3c/dom/UserDataHandler;)Ljava/lang/Object;	at com.google.gwt.uibinder.rebind.W3cDocumentBuilder.startElement(W3cDocumentBuilder.java:127)	at org.apache.xerces.parsers.AbstractSAXParser.startElement(Unknown Source)	at org.apache.xerces.impl.dtd.XMLDTDValidator.startElement(Unknown Source)	at org.apache.xerces.impl.XMLNSDocumentScannerImpl.scanStartElement(Unknown Source)	at org.apache.xerces.impl.XMLNSDocumentScannerImpl$NSContentDispatcher.scanRootElementHook(Unknown Source)	at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(Unknown Source)	at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)	at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)	at org.apache.xerces.parsers.DTDConfiguration.parse(Unknown Source)	at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)	at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)	at javax.xml.parsers.SAXParser.parse(SAXParser.java:392)	at com.google.gwt.uibinder.rebind.W3cDomHelper.documentFor(W3cDomHelper.java:74)	at com.google.gwt.uibinder.rebind.UiBinderGenerator.getW3cDoc(UiBinderGenerator.java:208)	at com.google.gwt.uibinder.rebind.UiBinderGenerator.generateOnce(UiBinderGenerator.java:183)	at com.google.gwt.uibinder.rebind.UiBinderGenerator.generate(UiBinderGenerator.java:128)	at com.google.gwt.core.ext.IncrementalGenerator.generateNonIncrementally(IncrementalGenerator.java:40)	at com.google.gwt.dev.javac.StandardGeneratorContext.runGeneratorIncrementally(StandardGeneratorContext.java:745)	at com.google.gwt.dev.cfg.RuleGenerateWith.realize(RuleGenerateWith.java:103)	at com.google.gwt.dev.shell.StandardRebindOracle$Rebinder.rebind(StandardRebindOracle.java:78)	at com.google.gwt.dev.shell.StandardRebindOracle.rebind(StandardRebindOracle.java:262)	at com.google.gwt.dev.shell.StandardRebindOracle.rebind(StandardRebindOracle.java:251)	at com.google.gwt.dev.PrecompilationContextCreator$1.getAllPossibleRebindAnswers(PrecompilationContextCreator.java:86)	at com.google.gwt.dev.jjs.impl.UnifyAst$UnifyVisitor.createStaticRebindExpression(UnifyAst.java:493)	at com.google.gwt.dev.jjs.impl.UnifyAst$UnifyVisitor.createRebindExpression(UnifyAst.java:463)	at com.google.gwt.dev.jjs.impl.UnifyAst$UnifyVisitor.handleMagicMethodCall(UnifyAst.java:588)	at com.google.gwt.dev.jjs.impl.UnifyAst$UnifyVisitor.endVisit(UnifyAst.java:293)	at com.google.gwt.dev.jjs.ast.JMethodCall.traverse(JMethodCall.java:268)	at com.google.gwt.dev.jjs.ast.JModVisitor.traverse(JModVisitor.java:361)	at com.google.gwt.dev.jjs.ast.JModVisitor.accept(JModVisitor.java:273)	at com.google.gwt.dev.jjs.ast.JModVisitor.accept(JModVisitor.java:265)	at com.google.gwt.dev.jjs.ast.JVisitor.accept(JVisitor.java:118)	at com.google.gwt.dev.jjs.ast.JDeclarationStatement.traverse(JDeclarationStatement.java:49)	at com.google.gwt.dev.jjs.ast.JModVisitor$ListContext.traverse(JModVisitor.java:88)	at com.google.gwt.dev.jjs.ast.JModVisitor.acceptWithInsertRemove(JModVisitor.java:331)	at com.google.gwt.dev.jjs.ast.JBlock.traverse(JBlock.java:92)	at com.google.gwt.dev.jjs.ast.JModVisitor.traverse(JModVisitor.java:361)	at com.google.gwt.dev.jjs.ast.JModVisitor.accept(JModVisitor.java:273)	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.JModVisitor.traverse(JModVisitor.java:361)	at com.google.gwt.dev.jjs.ast.JModVisitor.accept(JModVisitor.java:273)	at com.google.gwt.dev.jjs.ast.JModVisitor.accept(JModVisitor.java:265)	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.JModVisitor.traverse(JModVisitor.java:361)	at com.google.gwt.dev.jjs.ast.JModVisitor.accept(JModVisitor.java:273)	at com.google.gwt.dev.jjs.ast.JModVisitor.accept(JModVisitor.java:265)	at com.google.gwt.dev.jjs.impl.UnifyAst.mainLoop(UnifyAst.java:1379)	at com.google.gwt.dev.jjs.impl.UnifyAst.exec(UnifyAst.java:875)	at com.google.gwt.dev.jjs.JavaToJavaScriptCompiler.unifyJavaAst(JavaToJavaScriptCompiler.java:1410)	at com.google.gwt.dev.jjs.JavaToJavaScriptCompiler.constructJavaAst(JavaToJavaScriptCompiler.java:1222)	at com.google.gwt.dev.jjs.JavaToJavaScriptCompiler.precompile(JavaToJavaScriptCompiler.java:1140)	at com.google.gwt.dev.jjs.JavaToJavaScriptCompiler.precompile(JavaToJavaScriptCompiler.java:255)	at com.google.gwt.dev.Precompile.precompile(Precompile.java:255)	at com.google.gwt.dev.Precompile.precompile(Precompile.java:202)	at com.google.gwt.dev.Precompile.precompile(Precompile.java:143)	at com.google.gwt.dev.Compiler.compile(Compiler.java:204)	at com.google.gwt.dev.Compiler.compile(Compiler.java:155)	at com.google.gwt.dev.Compiler.compile(Compiler.java:144)	at com.google.gwt.dev.Compiler$1.run(Compiler.java:118)	at com.google.gwt.dev.CompileTaskRunner.doRun(CompileTaskRunner.java:55)	at com.google.gwt.dev.CompileTaskRunner.runWithAppropriateLogger(CompileTaskRunner.java:50)	at com.google.gwt.dev.Compiler.main(Compiler.java:125)