RequestFactory Error -- java.lang.IllegalArgumentException: Something other than a Java object was returned from JSNI method

The following is the other error i get frequently and this seems like
its more related to request factory
and I dont know why its happening ..Should I open a bug ?

I'm using GWT 2.4, browser Chrome 18.0.1025.1065

One or more exceptions caught, see full set in
UmbrellaException#getCauses -
CAUSE java.lang.IllegalArgumentException: Something other than a Java
object was returned from JSNI method
'@com.google.web.bindery.autobean.gwt.client.impl.ClientPropertyContext
$Setter::beanSetter(Lcom/google/web/bindery/autobean/shared/impl/
AbstractAutoBean;Ljava/lang/String;)': JS value of type boolean,
expected java.lang.Object
java.lang.IllegalArgumentException: Something other than a Java object
was returned from JSNI method
'@com.google.web.bindery.autobean.gwt.client.impl.ClientPropertyContext
$Setter::beanSetter(Lcom/google/web/bindery/autobean/shared/impl/
AbstractAutoBean;Ljava/lang/String;)': JS value of type boolean,
expected java.lang.Object
STACKTRACE :
com.google.web.bindery.requestfactory.shared.impl.AbstractRequestContext
$StandardPayloadDialect.processPayload(AbstractRequestContext.java:
387)
com.google.web.bindery.requestfactory.shared.impl.AbstractRequestContext
$5.onTransportSuccess(AbstractRequestContext.java:1108)
com.google.web.bindery.requestfactory.gwt.client.DefaultRequestTransport
$1.onResponseReceived(DefaultRequestTransport.java:136)
com.citrix.ws.democenter.module.shared.client.requestfactory.DemoCenterRequestTransport
$1.onResponseReceived(DemoCenterRequestTransport.java:84)
com.google.gwt.http.client.Request.fireOnResponseReceived(Request.java:
287)
com.google.gwt.http.client.RequestBuilder
$1.onReadyStateChange(RequestBuilder.java:395)
sun.reflect.GeneratedMethodAccessor352.invoke(Unknown Source)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:
25)
java.lang.reflect.Method.invoke(Method.java:597)
com.google.gwt.dev.shell.MethodAdaptor.invoke(MethodAdaptor.java:103)
com.google.gwt.dev.shell.MethodDispatch.invoke(MethodDispatch.java:71)
com.google.gwt.dev.shell.OophmSessionHandler.invoke(OophmSessionHandler.java:
172)
com.google.gwt.dev.shell.BrowserChannelServer.reactToMessagesWhileWaitingForReturn(BrowserChannelServer.java:
337)
com.google.gwt.dev.shell.BrowserChannelServer.invokeJavascript(BrowserChannelServer.java:
218)
com.google.gwt.dev.shell.ModuleSpaceOOPHM.doInvoke(ModuleSpaceOOPHM.java:
136)
com.google.gwt.dev.shell.ModuleSpace.invokeNative(ModuleSpace.java:
561)
com.google.gwt.dev.shell.ModuleSpace.invokeNativeObject(ModuleSpace.java:
269)
com.google.gwt.dev.shell.JavaScriptHost.invokeNativeObject(JavaScriptHost.java:
91)
com.google.gwt.core.client.impl.Impl.apply(Impl.java)
com.google.gwt.core.client.impl.Impl.entry0(Impl.java:213)
sun.reflect.GeneratedMethodAccessor345.invoke(Unknown Source)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:
25)
java.lang.reflect.Method.invoke(Method.java:597)
com.google.gwt.dev.shell.MethodAdaptor.invoke(MethodAdaptor.java:103)
com.google.gwt.dev.shell.MethodDispatch.invoke(MethodDispatch.java:71)
com.google.gwt.dev.shell.OophmSessionHandler.invoke(OophmSessionHandler.java:
172)
com.google.gwt.dev.shell.BrowserChannelServer.reactToMessages(BrowserChannelServer.java:
292)
com.google.gwt.dev.shell.BrowserChannelServer.processConnection(BrowserChannelServer.java:
546)
com.google.gwt.dev.shell.BrowserChannelServer.run(BrowserChannelServer.java:
363)
java.lang.Thread.run(Thread.java:680)
from
sourceClasscom.google.web.bindery.event.shared.UmbrellaExceptionwith
exception com.google.web.bindery.event.shared.UmbrellaException: One
or more exceptions caught, see full set in UmbrellaException#getCauses

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