[ArgumentNullException: Value cannot be null.
Parameter name: source]
System.Linq.Enumerable.First(IEnumerable`1 source) +344
Zipporah.Generic.Web.Controllers.Core.ActionFilters.WorkflowAssertCanAccessAttribute.OnActionExecuting(ActionExecutingContext filterContext) in C:\SourceCode\NeoDev\RoyalParks\Generic\trunk\core\Web\Zipporah.Generic.Web.Controllers\ActionFilters\WorkflowAssertCanAccessAttribute.cs:38
System.Web.Mvc.ControllerActionInvoker.InvokeActionMethodFilter(IActionFilter filter, ActionExecutingContext preContext, Func`1 continuation) +47
System.Web.Mvc.ControllerActionInvoker.InvokeActionMethodFilter(IActionFilter filter, ActionExecutingContext preContext, Func`1 continuation) +433
System.Web.Mvc.ControllerActionInvoker.InvokeAction(ControllerContext controllerContext, String actionName) +623
System.Web.Mvc.Controller.ExecuteCore() +137
System.Web.Mvc.ControllerBase.Execute(RequestContext requestContext) +91
Zipporah.Generic.Web.Controllers.Core.ZipController.Execute(RequestContext requestContext) in C:\SourceCode\NeoDev\RoyalParks\Generic\trunk\core\Web\Zipporah.Generic.Web.Controllers\ZipController.cs:108
System.Web.Mvc.<>c__DisplayClassb.<BeginProcessRequest>b__5() +54
System.Web.Mvc.Async.<>c__DisplayClass1.<MakeVoidDelegate>b__0() +25
System.Web.Mvc.<>c__DisplayClasse.<EndProcessRequest>b__d() +51
System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +602
System.Web.HttpApplication.ExecuteStepImpl(IExecutionStep step) +195
System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +128
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