Error when clearing the selection of a drop down

Hi,

I get the below error when I hit {Clear Selection} from a drop down menu. Please advise.

Exception has been thrown by the target of an invocation.

at System.RuntimeMethodHandle.InvokeMethod(Object target, Object[] arguments, Signature sig, Boolean constructor)at System.Reflection.RuntimeMethodInfo.UnsafeInvokeInternal(Object obj, Object[] parameters, Object[] arguments)at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)at Touchpaper.Framework.Data.DefaultCalculationStrategy.Calculate(DataObjectProxy proxy, MethodInfo methodInfo, IAttributeType attributeType)at Touchpaper.Framework.Data.Calculator.DoCalculation(IDataObject dataObject, IAttributeType attributeType)at Touchpaper.Framework.Data.DataObjectCalculator.CalculateOnDemand(IDataObject dataObject, String attributeName)at Touchpaper.Web.Console.Controllers.ObjectController.InvokeFormFunctions(ICollection`1 formFunctionAttributes, IDataObjectCalculator calculator, IDataObject dataObject, ObjectForm form)at Touchpaper.Web.Console.Controllers.ObjectController.PopulateAffectedFormFunctionCalculatedFields(IDataObject dataObject, ObjectForm form, IFormItem item)at Touchpaper.Web.Console.Controllers.ObjectController.PopulateCalculatedFields(IDataObject dataObject, ObjectForm form, FormControl triggerControl)at Touchpaper.Web.Console.Controllers.ObjectController.RefreshForm(ObjectParameters parameters)at Touchpaper.Web.Console.Controllers.ObjectController.RefreshForm()at lambda_method(Closure , ControllerBase , Object[] )at System.Web.Mvc.ReflectedActionDescriptor.Execute(ControllerContext controllerContext, IDictionary`2 parameters)at System.Web.Mvc.ControllerActionInvoker.InvokeActionMethod(ControllerContext controllerContext, ActionDescriptor actionDescriptor, IDictionary`2 parameters)at System.Web.Mvc.Async.AsyncControllerActionInvoker.<>c__DisplayClass37.<>c__DisplayClass39.b__33()

at System.Web.Mvc.Async.AsyncControllerActionInvoker.<>c__DisplayClass4f.b__49()

at System.Web.Mvc.Async.AsyncControllerActionInvoker.<>c__DisplayClass4f.b__49()

at System.Web.Mvc.Async.AsyncControllerActionInvoker.<>c__DisplayClass4f.b__49()

at System.Web.Mvc.Async.AsyncControllerActionInvoker.<>c__DisplayClass4f.b__49()

at System.Web.Mvc.Async.AsyncControllerActionInvoker.<>c__DisplayClass37.b__36(IAsyncResult asyncResult)

at System.Web.Mvc.Async.AsyncControllerActionInvoker.<>c__DisplayClass25.<>c__DisplayClass2a.b__20()

at System.Web.Mvc.Async.AsyncControllerActionInvoker.<>c__DisplayClass25.b__22(IAsyncResult asyncResult)

Inner Exception: - Object reference not set to an instance of an object.

at System.Object.GetType()

at Boo.Lang.Runtime.RuntimeServices.Dispatch(Object target, String cacheKeyName, Type[] cacheKeyTypes, Object[] args, DispatcherFactory factory)

at Boo.Lang.Runtime.RuntimeServices.Dispatch(Object target, String cacheKeyName, Object[] args, DispatcherFactory factory)

at Boo.Lang.Runtime.RuntimeServices.GetProperty(Object target, String name)

at TestModule.GetAttributeValue(Object Incident) in c:\windows\system32\inetsrv\Test:line 6

Thanks,

Bhargava.