System.InvalidOperationException: Operation is not valid due to the current state of the object.
at System.Web.HttpRequest.FillInFormCollection()
at System.Web.HttpRequest.get_Form()
at Rhino.Commons.LongConversationManager.LoadConversationFromRequest(Boolean& privateConversation)
at Rhino.Commons.LongConversationManager.LoadConversation()
at Rhino.Commons.HttpModules.UnitOfWorkApplication.UnitOfWorkApplication_BeginRequest(Object sender, EventArgs e)
at System.Web.HttpApplication.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)

Solution:

Add this key in web.config

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