google app engine - Failed to load module from user agent at localhost -

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when tried run gwt quick start tutorial got error message!

how can fix issue?

p.s.

  1. i installed gwt developer plugin firefox 1.23
  2. i installed eclipse ubuntu 13.04 repository (version 3.8.1)
  3. i gwt ubuntu 13.04 repository (version 2.4.0)

00:27:29.230 [error] [hellostupid] failed load module 'hellostupid' user agent 'mozilla/5.0 (x11; ubuntu; linux x86_64; rv:23.0) gecko/20100101 firefox/23.0' @ localhost:40544

java.lang.nullpointerexception: null     @ com.google.gwt.dev.javac.jsnichecker.getsuppressedwarnings(jsnichecker.java:565)     @ com.google.gwt.dev.javac.jsnichecker$jsnideclchecker.visit(jsnichecker.java:135)     @ org.eclipse.jdt.internal.compiler.ast.typedeclaration.traverse(typedeclaration.java:1233)     @ org.eclipse.jdt.internal.compiler.ast.compilationunitdeclaration.traverse(compilationunitdeclaration.java:679)     @ com.google.gwt.dev.javac.jsnichecker.check(jsnichecker.java:615)     @ com.google.gwt.dev.javac.jsnichecker.check(jsnichecker.java:559)     @ com.google.gwt.dev.javac.compilationstatebuilder$compilemorelater$unitprocessorimpl.process(compilationstatebuilder.java:83)     @ com.google.gwt.dev.javac.jdtcompiler$compilerimpl.process(jdtcompiler.java:251)     @ org.eclipse.jdt.internal.compiler.compiler.compile(compiler.java:464)     @ com.google.gwt.dev.javac.jdtcompiler.docompile(jdtcompiler.java:710)     @ com.google.gwt.dev.javac.compilationstatebuilder$compilemorelater.compile(compilationstatebuilder.java:235)     @ com.google.gwt.dev.javac.compilationstatebuilder.dobuildfrom(compilationstatebuilder.java:447)     @ com.google.gwt.dev.javac.compilationstatebuilder.buildfrom(compilationstatebuilder.java:370)     @ com.google.gwt.dev.cfg.moduledef.getcompilationstate(moduledef.java:360)     @ com.google.gwt.dev.devmodebase$uibrowserwidgethostimpl.createmodulespacehost(devmodebase.java:110)     @ com.google.gwt.dev.shell.oophmsessionhandler.loadmodule(oophmsessionhandler.java:197)     @ com.google.gwt.dev.shell.browserchannelserver.processconnection(browserchannelserver.java:525)     @ com.google.gwt.dev.shell.browserchannelserver.run(browserchannelserver.java:363)     @ java.lang.thread.run(thread.java:724)

i facing same issue , can try if getting problem -

1.[error] [mysecondproj] - unable initialize static dispatcher

2.[error] [mysecondproj] - failed load module 'mysecondproj' user agent 'mozilla/5.0 (windows nt 6.1; wow64) applewebkit/537.36 (khtml, gecko) chrome/33.0.1712.2 safari/537.36' @ 127.0.0.1:63405

http://stackoverflow.com/questions/29411048/gwt-starting-sample-project

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