Error when using scaffolded ApplicationRequestFactory with IE like, firefox, created, error, Error

amy

I get an error when I am using IE7/IE8 (firefox works fine) when I create a new GWT module which uses the ApplicationRequestFactory

I have done the following1. created a Roo project from the shell (much like expenses.roo in roo/samples)2. imported the project into STS3. created a new gwt module which calls the backend (using the ApplicationRequestFactory). The module inherits from ApplicationCommon. When I call the backend I get the error listed below.

I have tried coping the code from the scaffold class, but I still get an error in IE7/IE8 (not in firefox)

Any help?, what I am doing wrong?

Versions:
Roo: 1.1.0M3
Java: 1.6.0_20
STS: Version: 2.5.0.M3

Stacktrace:

com.google.gwt.core.client.JavaScriptException: (TypeError): '$wnd.JSON' is null or not an objectnumber: -2146823281description: '$wnd.JSON' is null or not an object   at com.google.gwt.dev.shell.BrowserChannelServer.invo  keJavascript(BrowserChannelServer.java:237)   at com.google.gwt.dev.shell.ModuleSpaceOOPHM.doInvoke  (ModuleSpaceOOPHM.java:126)   at com.google.gwt.dev.shell.ModuleSpace.invokeNative(  ModuleSpace.java:552)   at com.google.gwt.dev.shell.ModuleSpace.invokeNativeO  bject(ModuleSpace.java:269)   at com.google.gwt.dev.shell.JavaScriptHost.invokeNati  veObject(JavaScriptHost.java:91)   at com.google.gwt.requestfactory.client.impl.ClientRe  questHelper$MyJSO$.toJsonString$(ClientRequestHelp  er.java)   at com.google.gwt.requestfactory.client.impl.ClientRe  questHelper$MyJSO$.access$1(ClientRequestHelper.ja  va:49)   at com.google.gwt.requestfactory.client.impl.ClientRe  questHelper.getRequestString(ClientRequestHelper.j  ava:63)   at com.google.gwt.requestfactory.client.impl.RequestF  actoryJsonImpl.fire(RequestFactoryJsonImpl.java:84  )   at com.google.gwt.requestfactory.client.impl.Abstract  Request.fire(AbstractRequest.java:76)   at com.ibm.gwt.client.Eplaster.onModuleLoad(Eplaster.  java:39)   at sun.reflect.NativeMethodAccessorImpl.invoke0(Nativ  e Method)   at sun.reflect.NativeMethodAccessorImpl.invoke(Unknow  n Source)   at sun.reflect.DelegatingMethodAccessorImpl.invoke(Un  known Source)   at java.lang.reflect.Method.invoke(Unknown Source)   at com.google.gwt.dev.shell.ModuleSpace.onLoad(Module  Space.java:397)   at com.google.gwt.dev.shell.OophmSessionHandler.loadM  odule(OophmSessionHandler.java:183)   at com.google.gwt.dev.shell.BrowserChannelServer.proc  essConnection(BrowserChannelServer.java:510)   at com.google.gwt.dev.shell.BrowserChannelServer.run(  BrowserChannelServer.java:352)   at java.lang.Thread.run(Unknown Source)