My GWT 2.6.1 project is getting compiled and when i run in hosted mode, I 
get the following error. How to fix it?

12:50:15.471 [ERROR] [mediamanager] Wed Aug 13 12:50:15 IST 2014 
client.MediaManager
SEVERE: MediaManager onUncaughtException

com.google.gwt.dev.shell.HostedModeException: invoke arguments: JS value of 
type undefined, expected int
    at 
com.google.gwt.dev.shell.JsValueGlue.getIntRange(JsValueGlue.java:266)
    at com.google.gwt.dev.shell.JsValueGlue.get(JsValueGlue.java:144)
    at 
com.google.gwt.dev.shell.MethodDispatch.invoke(MethodDispatch.java:65)
    at 
com.google.gwt.dev.shell.OophmSessionHandler.invoke(OophmSessionHandler.java:172)
    at 
com.google.gwt.dev.shell.BrowserChannelServer.reactToMessagesWhileWaitingForReturn(BrowserChannelServer.java:338)
    at 
com.google.gwt.dev.shell.BrowserChannelServer.invokeJavascript(BrowserChannelServer.java:219)
    at 
com.google.gwt.dev.shell.ModuleSpaceOOPHM.doInvoke(ModuleSpaceOOPHM.java:136)
    at 
com.google.gwt.dev.shell.ModuleSpace.invokeNative(ModuleSpace.java:576)
    at 
com.google.gwt.dev.shell.ModuleSpace.invokeNativeObject(ModuleSpace.java:284)
    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:356)
    at sun.reflect.GeneratedMethodAccessor43.invoke(Unknown Source)
    at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    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:338)
    at 
com.google.gwt.dev.shell.BrowserChannelServer.invokeJavascript(BrowserChannelServer.java:219)
    at 
com.google.gwt.dev.shell.ModuleSpaceOOPHM.doInvoke(ModuleSpaceOOPHM.java:136)
    at 
com.google.gwt.dev.shell.ModuleSpace.invokeNative(ModuleSpace.java:576)
    at 
com.google.gwt.dev.shell.ModuleSpace.invokeNativeObject(ModuleSpace.java:284)
    at 
com.google.gwt.dev.shell.JavaScriptHost.invokeNativeObject(JavaScriptHost.java:91)
    at com.smartgwt.client.widgets.tree.TreeGrid.canEditCell(TreeGrid.java)
    
client.core.view.FolderPaneView.setFolderContents(FolderPaneView.java:68)
    
client.core.presenter.FolderPanePresenter$2.onSuccess(FolderPanePresenter.java:129)
    
client.core.presenter.FolderPanePresenter$2.onSuccess(FolderPanePresenter.java:1)
    at 
com.google.gwt.user.client.rpc.impl.RequestCallbackAdapter.onResponseReceived(RequestCallbackAdapter.java:232)
    at 
com.google.gwt.http.client.Request.fireOnResponseReceived(Request.java:259)
    at 
com.google.gwt.http.client.RequestBuilder$1.onReadyStateChange(RequestBuilder.java:412)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    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:338)
    at 
com.google.gwt.dev.shell.BrowserChannelServer.invokeJavascript(BrowserChannelServer.java:219)
    at 
com.google.gwt.dev.shell.ModuleSpaceOOPHM.doInvoke(ModuleSpaceOOPHM.java:136)
    at 
com.google.gwt.dev.shell.ModuleSpace.invokeNative(ModuleSpace.java:576)
    at 
com.google.gwt.dev.shell.ModuleSpace.invokeNativeObject(ModuleSpace.java:284)
    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:356)
    at sun.reflect.GeneratedMethodAccessor43.invoke(Unknown Source)
    at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    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:293)
    at 
com.google.gwt.dev.shell.BrowserChannelServer.processConnection(BrowserChannelServer.java:547)
    at 
com.google.gwt.dev.shell.BrowserChannelServer.run(BrowserChannelServer.java:364)
    at java.lang.Thread.run(Thread.java:662)

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