Why can't I run the getting started tutorial?

[Sergio Santamaria Torres]

Well, I will do all the steps from the getting started and I receive
this error when I'll run it...
I don't know why says it...
Thank for your help!


15:38:24.312 [ERROR] [mapsexample] Uncaught exception escaped

java.lang.ExceptionInInitializerError: null
at com.google.gwt.maps.client.MapWidget.<init>
(MapWidget.java:253)
at com.google.gwt.maps.client.MapWidget.<init>
(MapWidget.java:284)
at com.google.gwt.maps.client.MapWidget.<init>
(MapWidget.java:235)
at
com.example.mapsExample.client.MapsExample.buildUi(MapsExample.java:
40)
at com.example.mapsExample.client.MapsExample.access
$0(MapsExample.java:36)
at com.example.mapsExample.client.MapsExample
$1.run(MapsExample.java:30)
at
com.google.gwt.ajaxloader.client.ExceptionHelper.runProtected(ExceptionHelper.java:
36)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at
com.google.gwt.dev.shell.MethodAdaptor.invoke(MethodAdaptor.java:103)
at
com.google.gwt.dev.shell.MethodDispatch.invoke(MethodDispatch.java:71)
at
com.google.gwt.dev.shell.OophmSessionHandler.invoke(OophmSessionHandler.java:
172)
at
com.google.gwt.dev.shell.BrowserChannelServer.reactToMessages(BrowserChannelServer.java:
292)
at
com.google.gwt.dev.shell.BrowserChannelServer.processConnection(BrowserChannelServer.java:
546)
at
com.google.gwt.dev.shell.BrowserChannelServer.run(BrowserChannelServer.java:
363)
at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.RuntimeException: Deferred binding failed for
'com.google.gwt.maps.client.impl.MapImpl' (did you forget to inherit a
required module?)
at
com.google.gwt.dev.shell.GWTBridgeImpl.create(GWTBridgeImpl.java:53)
at com.google.gwt.core.client.GWT.create(GWT.java:97)
at com.google.gwt.maps.client.impl.MapImpl.<clinit>
(MapImpl.java:45)
at com.google.gwt.maps.client.MapWidget.<init>
(MapWidget.java:253)
at com.google.gwt.maps.client.MapWidget.<init>
(MapWidget.java:284)
at com.google.gwt.maps.client.MapWidget.<init>
(MapWidget.java:235)
at
com.example.mapsExample.client.MapsExample.buildUi(MapsExample.java:
40)
at com.example.mapsExample.client.MapsExample.access
$0(MapsExample.java:36)
at com.example.mapsExample.client.MapsExample
$1.run(MapsExample.java:30)
at
com.google.gwt.ajaxloader.client.ExceptionHelper.runProtected(ExceptionHelper.java:
36)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at
com.google.gwt.dev.shell.MethodAdaptor.invoke(MethodAdaptor.java:103)
at
com.google.gwt.dev.shell.MethodDispatch.invoke(MethodDispatch.java:71)
at
com.google.gwt.dev.shell.OophmSessionHandler.invoke(OophmSessionHandler.java:
172)
at
com.google.gwt.dev.shell.BrowserChannelServer.reactToMessages(BrowserChannelServer.java:
292)
at
com.google.gwt.dev.shell.BrowserChannelServer.processConnection(BrowserChannelServer.java:
546)
at
com.google.gwt.dev.shell.BrowserChannelServer.run(BrowserChannelServer.java:
363)
at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.IncompatibleClassChangeError: Found interface
com.google.gwt.core.ext.typeinfo.JClassType, but class was expected
at
com.google.gwt.maps.jsio.rebind.JSWrapperGenerator.generate(JSWrapperGenerator.java:
277)
at
com.google.gwt.core.ext.GeneratorExtWrapper.generate(GeneratorExtWrapper.java:
48)
at
com.google.gwt.core.ext.GeneratorExtWrapper.generateIncrementally(GeneratorExtWrapper.java:
60)
at
com.google.gwt.dev.javac.StandardGeneratorContext.runGeneratorIncrementally(StandardGeneratorContext.java:
647)
at
com.google.gwt.dev.cfg.RuleGenerateWith.realize(RuleGenerateWith.java:
41)
at com.google.gwt.dev.shell.StandardRebindOracle
$Rebinder.rebind(StandardRebindOracle.java:78)
at
com.google.gwt.dev.shell.StandardRebindOracle.rebind(StandardRebindOracle.java:
268)
at
com.google.gwt.dev.shell.ShellModuleSpaceHost.rebind(ShellModuleSpaceHost.java:
141)
at com.google.gwt.dev.shell.ModuleSpace.rebind(ModuleSpace.java:
585)
at
com.google.gwt.dev.shell.ModuleSpace.rebindAndCreate(ModuleSpace.java:
455)
at
com.google.gwt.dev.shell.GWTBridgeImpl.create(GWTBridgeImpl.java:49)
at com.google.gwt.core.client.GWT.create(GWT.java:97)
at com.google.gwt.maps.client.impl.MapImpl.<clinit>
(MapImpl.java:45)
at com.google.gwt.maps.client.MapWidget.<init>
(MapWidget.java:253)
at com.google.gwt.maps.client.MapWidget.<init>
(MapWidget.java:284)
at com.google.gwt.maps.client.MapWidget.<init>
(MapWidget.java:235)
at
com.example.mapsExample.client.MapsExample.buildUi(MapsExample.java:
40)
at com.example.mapsExample.client.MapsExample.access
$0(MapsExample.java:36)
at com.example.mapsExample.client.MapsExample
$1.run(MapsExample.java:30)
at
com.google.gwt.ajaxloader.client.ExceptionHelper.runProtected(ExceptionHelper.java:
36)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at
com.google.gwt.dev.shell.MethodAdaptor.invoke(MethodAdaptor.java:103)
at
com.google.gwt.dev.shell.MethodDispatch.invoke(MethodDispatch.java:71)
at
com.google.gwt.dev.shell.OophmSessionHandler.invoke(OophmSessionHandler.java:
172)
at
com.google.gwt.dev.shell.BrowserChannelServer.reactToMessages(BrowserChannelServer.java:
292)
at
com.google.gwt.dev.shell.BrowserChannelServer.processConnection(BrowserChannelServer.java:
546)
at
com.google.gwt.dev.shell.BrowserChannelServer.run(BrowserChannelServer.java:
363)
at java.lang.Thread.run(Unknown Source)