Bonjour,
Je viens d'installer et exécuter l'exemple Desktop app disponible sur ce lien http://dev.sencha.com/deploy/ext-4.0...p/desktop.html

le problème s'avère lors de l'authentification, je ne peux plus s'authentifier ou créer un nouvel utilisateur.
Voici le message d'erreur après avoir coher "New User"
Code : Sélectionner tout - Visualiser dans une fenêtre à part
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com.google.gwt.event.shared.UmbrellaException: One or more exceptions caught, see full set in UmbrellaException#getCauses
	at com.google.gwt.event.shared.HandlerManager.fireEvent(HandlerManager.java:129)
	at com.sencha.gxt.cell.core.client.AbstractEventCell.fireEvent(AbstractEventCell.java:89)
	at com.sencha.gxt.cell.core.client.ButtonCell.onClick(ButtonCell.java:428)
	at com.sencha.gxt.cell.core.client.ButtonCell.onBrowserEvent(ButtonCell.java:289)
	at com.sencha.gxt.widget.core.client.cell.CellComponent.onBrowserEvent(CellComponent.java:221)
	at com.sencha.gxt.widget.core.client.button.CellButtonBase.onBrowserEvent(CellButtonBase.java:163)
	at com.google.gwt.user.client.DOM.dispatchEventImpl(DOM.java:1351)
	at com.google.gwt.user.client.DOM.dispatchEvent(DOM.java:1307)
	at sun.reflect.GeneratedMethodAccessor39.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.reactToMessagesWhileWaitingForReturn(BrowserChannelServer.java:337)
	at com.google.gwt.dev.shell.BrowserChannelServer.invokeJavascript(BrowserChannelServer.java:218)
	at com.google.gwt.dev.shell.ModuleSpaceOOPHM.doInvoke(ModuleSpaceOOPHM.java:136)
	at com.google.gwt.dev.shell.ModuleSpace.invokeNative(ModuleSpace.java:561)
	at com.google.gwt.dev.shell.ModuleSpace.invokeNativeObject(ModuleSpace.java:269)
	at com.google.gwt.dev.shell.JavaScriptHost.invokeNativeObject(JavaScriptHost.java:91)
	at com.google.gwt.core.client.impl.Impl.apply(Impl.java)
	at com.google.gwt.core.client.impl.Impl.entry0(Impl.java:213)
	at sun.reflect.GeneratedMethodAccessor34.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.NoClassDefFoundError: org/json/JSONException
	at com.google.web.bindery.autobean.shared.impl.StringQuoter.createSplittable(StringQuoter.java:58)
	at com.google.web.bindery.autobean.shared.impl.AbstractAutoBean.<init>(AbstractAutoBean.java:71)
	at com.goldensoft.gwt.client.ProfileModelAutoBean.<init>(ProfileModelAutoBean.java:32)
	at com.goldensoft.gwt.client.ProfileFactoryImpl.profileModel(ProfileFactoryImpl.java:22)
	at com.goldensoft.gwt.client.DesktopAppPresenterImpl.createNewUser(DesktopAppPresenterImpl.java:211)
	at com.goldensoft.gwt.client.DesktopAppPresenterImpl.onLogin(DesktopAppPresenterImpl.java:151)
	at com.goldensoft.gwt.client.LoginPresenterImpl.onLogin(LoginPresenterImpl.java:58)
	at com.goldensoft.gwt.client.LoginViewImpl$1.onSelect(LoginViewImpl.java:173)
	at com.sencha.gxt.widget.core.client.event.SelectEvent.dispatch(SelectEvent.java:65)
	at com.sencha.gxt.widget.core.client.event.SelectEvent.dispatch(SelectEvent.java:1)
	at com.google.gwt.event.shared.GwtEvent.dispatch(GwtEvent.java:1)
	at com.google.web.bindery.event.shared.EventBus.dispatchEvent(EventBus.java:40)
	at com.google.web.bindery.event.shared.SimpleEventBus.doFire(SimpleEventBus.java:193)
	at com.google.web.bindery.event.shared.SimpleEventBus.fireEvent(SimpleEventBus.java:88)
	at com.google.gwt.event.shared.HandlerManager.fireEvent(HandlerManager.java:127)
	... 31 more
Caused by: java.lang.ClassNotFoundException
	at com.google.gwt.dev.shell.CompilingClassLoader$MultiParentClassLoader.findClass(CompilingClassLoader.java:365)
	at java.lang.ClassLoader.loadClass(Unknown Source)
	at java.lang.ClassLoader.loadClass(Unknown Source)
	... 46 more