Error In Enterprise Portal

Dynamics Object Adapter Call failed.

Specified argument was out of the range of valid values.

Parameter name: index

Microsoft.Dynamics.Framework.Data.AX

   at Microsoft.Dynamics.AX.Framework.Portal.Data.DataSetView.GetElement(Int32 index)

   at Microsoft.Dynamics.AX.Framework.Portal.Data.DataSetView.GetCurrent(Boolean forceKernelFetch)

   at Microsoft.Dynamics.AX.Framework.Portal.Data.DataSetView.FormDataSource_CacheChanged(Object sender, Object args)

   at Microsoft.Dynamics.AX.ManagedInterop.ClrBridgeImpl.ExecuteHandler(ClrBridgeImpl* , ObjectWrapper* pObjectWrapperHandler, ObjectWrapper* pObjectWrapperSender, ObjectWrapper* pObjectWrapperEventArgs)

   at interpret.{ctor}(interpret* )

   at AxEventDelegate.kcInvoke(AxEventDelegate* , interpret* ip)

   at cqlClass.callEx(cqlClass* , Char* , interpret* )

   at AxCore.AxRuntime.Call(AxRuntime* , IAxObject* axObject, String methodName, Type returnType, Object& result, Object[] paramList)

   at Microsoft.Dynamics.AX.ManagedInterop.Object.CallWithReturnType(String methodName, Type returnType, Object[] paramList)

   at Microsoft.Dynamics.Framework.BusinessConnector.Session.DynamicsObjectAdapter.Call(String methodName)

When I am Trying to Open a page in Enterprise Portal in Ax 2012,I am getting the above error.

Kindly help.