Hi

I am new to Umbraco. I am implementing the checkboxList control in our project. I am getting following error sporadically

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Server Error in '/Umbraco5RTMWork' Application.
An instance of ModelMetadataProvider was found in the resolver as well as a custom registered provider in ModelMetadataProviders.Current. Please set only one or the other.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.InvalidOperationException: An instance of ModelMetadataProvider was found in the resolver as well as a custom registered provider in ModelMetadataProviders.Current. Please set only one or the other.

Source Error:

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

Stack Trace:

[InvalidOperationException: An instance of ModelMetadataProvider was found in the resolver as well as a custom registered provider in ModelMetadataProviders.Current. Please set only one or the other.]
   System.Web.Mvc.SingleServiceResolver`1.get_Current() +369
   System.Web.Mvc.ModelMetadataProviders.get_CurrentInternal() +24
   System.Web.Mvc.ControllerActionInvoker.GetParameterValue(ControllerContext controllerContext, ParameterDescriptor parameterDescriptor) +303
   System.Web.Mvc.ControllerActionInvoker.GetParameterValues(ControllerContext controllerContext, ActionDescriptor actionDescriptor) +153
   System.Web.Mvc.ControllerActionInvoker.InvokeAction(ControllerContext controllerContext, String actionName) +825600
   System.Web.Mvc.Controller.ExecuteCore() +159
   System.Web.Mvc.ControllerBase.Execute(RequestContext requestContext) +335
   System.Web.Mvc.<>c__DisplayClassb.<BeginProcessRequest>b__5() +62
   System.Web.Mvc.Async.<>c__DisplayClass1.<MakeVoidDelegate>b__0() +20
   System.Web.Mvc.<>c__DisplayClasse.<EndProcessRequest>b__d() +54
   System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +469
   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +375


Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.0.30319.272

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When I comment the @Html.CheckboxListFor line, page gets reneder.

I wrote one custom class that extends

DefaultModelBinder
 from using System.Web.Mvc
 namespace

later on I register this in Global.asax.cs file as

 ModelBinders.Binders.DefaultBinder = new DefaultGraphModelBinder(); 

I am not getting the selected items from the checkboxlist control after POST in controller. I guess model binding is the problem

Can any one please help.

Thanks in anticipation