после какого-то момента перестало работать сохранение
получаю ошибку
An item with the same key has already been added
она приходит до точки останова в экшене, то есть я так понимаю ошибка в модели, но не могу понять где именно
проверил что бы в базовом классе и в наследнике не было одинаковых полей и закоментил
классы огромные поэтому не привожу
подскажите как искать ошибку,в каких полях
в output прошёлся и исправил все предупреждения с new сокрытием, не знаю что делать

Server Error in '/' Application.
An item with the same key has already been added.
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.ArgumentException: An item with the same key has already been added.

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:


[ArgumentException: An item with the same key has already been added.]
System.ThrowHelper.ThrowArgumentException(ExceptionResource resource) +60
System.Collections.Generic.Dictionary`2.Insert(TKey key, TValue value, Boolean add) +14338200
System.Collections.Generic.CollectionExtensions.ToDictionaryFast(TValue[] array, Func`2 keySelector, IEqualityComparer`1 comparer) +135
System.Web.Mvc.ModelBindingContext.get_PropertyMetadata() +184
System.Web.Mvc.DefaultModelBinder.BindProperty(ControllerContext controllerContext, ModelBindingContext bindingContext, PropertyDescriptor propertyDescriptor) +233
Castle.DynamicProxy.AbstractInvocation.Proceed() +106
Glimpse.Core.Extensions.AlternateMethodContextExtensions.TryProceedWithTimer(IAlternateMethodContext context, TimerResult& timerResult) +73
Glimpse.Core.Extensibility.AlternateMethod.NewImplementation(IAlternateMethodContext context) +32
Castle.DynamicProxy.AbstractInvocation.Proceed() +452
System.Web.Mvc.DefaultModelBinder.BindProperties(ControllerContext controllerContext, ModelBindingContext bindingContext) +164
System.Web.Mvc.DefaultModelBinder.BindComplexElementalModel(ControllerContext controllerContext, ModelBindingContext bindingContext, Object model) +64
System.Web.Mvc.DefaultModelBinder.BindComplexModel(ControllerContext controllerContext, ModelBindingContext bindingContext) +1942
Castle.Proxies.Invocations.DefaultModelBinder_BindModel.InvokeMethodOnTarget() +141
Castle.DynamicProxy.AbstractInvocation.Proceed() +106
Glimpse.Core.Extensions.AlternateMethodContextExtensions.TryProceedWithTimer(IAlternateMethodContext context, TimerResult& timerResult) +73
Glimpse.Core.Extensibility.AlternateMethod.NewImplementation(IAlternateMethodContext context) +32
Castle.DynamicProxy.AbstractInvocation.Proceed() +452
Castle.Proxies.DefaultModelBinderProxy.BindModel(ControllerContext controllerContext, ModelBindingContext bindingContext) +255
System.Web.Mvc.DefaultModelBinder.UpdateCollection(ControllerContext controllerContext, ModelBindingContext bindingContext, Type elementType) +624
System.Web.Mvc.DefaultModelBinder.BindComplexModel(ControllerContext controllerContext, ModelBindingContext bindingContext) +610
Castle.Proxies.Invocations.DefaultModelBinder_BindModel.InvokeMethodOnTarget() +141
Castle.DynamicProxy.AbstractInvocation.Proceed() +106
Glimpse.Core.Extensions.AlternateMethodContextExtensions.TryProceedWithTimer(IAlternateMethodContext context, TimerResult& timerResult) +73
Glimpse.Core.Extensibility.AlternateMethod.NewImplementation(IAlternateMethodContext context) +32
Castle.DynamicProxy.AbstractInvocation.Proceed() +452
Castle.Proxies.DefaultModelBinderProxy.BindModel(ControllerContext controllerContext, ModelBindingContext bindingContext) +255
System.Web.Mvc.DefaultModelBinder.GetPropertyValue(ControllerContext controllerContext, ModelBindingContext bindingContext, PropertyDescriptor propertyDescriptor, IModelBinder propertyBinder) +35
System.Web.Mvc.DefaultModelBinder.BindProperty(ControllerContext controllerContext, ModelBindingContext bindingContext, PropertyDescriptor propertyDescriptor) +490
Castle.DynamicProxy.AbstractInvocation.Proceed() +106
Glimpse.Core.Extensions.AlternateMethodContextExtensions.TryProceedWithTimer(IAlternateMethodContext context, TimerResult& timerResult) +73
Glimpse.Core.Extensibility.AlternateMethod.NewImplementation(IAlternateMethodContext context) +32
Castle.DynamicProxy.AbstractInvocation.Proceed() +452
System.Web.Mvc.DefaultModelBinder.BindProperties(ControllerContext controllerContext, ModelBindingContext bindingContext) +164
System.Web.Mvc.DefaultModelBinder.BindComplexElementalModel(ControllerContext controllerContext, ModelBindingContext bindingContext, Object model) +64
System.Web.Mvc.DefaultModelBinder.BindComplexModel(ControllerContext controllerContext, ModelBindingContext bindingContext) +1942
Castle.Proxies.Invocations.DefaultModelBinder_BindModel.InvokeMethodOnTarget() +141
Castle.DynamicProxy.AbstractInvocation.Proceed() +106
Glimpse.Core.Extensions.AlternateMethodContextExtensions.TryProceedWithTimer(IAlternateMethodContext context, TimerResult& timerResult) +73
Glimpse.Core.Extensibility.AlternateMethod.NewImplementation(IAlternateMethodContext context) +32
Castle.DynamicProxy.AbstractInvocation.Proceed() +452
Castle.Proxies.DefaultModelBinderProxy.BindModel(ControllerContext controllerContext, ModelBindingContext bindingContext) +255
System.Web.Mvc.DefaultModelBinder.UpdateCollection(ControllerContext controllerContext, ModelBindingContext bindingContext, Type elementType) +624
Castle.Proxies.Invocations.DefaultModelBinder_BindModel.InvokeMethodOnTarget() +141
Castle.DynamicProxy.AbstractInvocation.Proceed() +106
Glimpse.Core.Extensions.AlternateMethodContextExtensions.TryProceedWithTimer(IAlternateMethodContext context, TimerResult& timerResult) +73
Glimpse.Core.Extensibility.AlternateMethod.NewImplementation(IAlternateMethodContext context) +32
Castle.DynamicProxy.AbstractInvocation.Proceed() +452
Castle.Proxies.DefaultModelBinderProxy.BindModel(ControllerContext controllerContext, ModelBindingContext bindingContext) +255
System.Web.Mvc.DefaultModelBinder.GetPropertyValue(ControllerContext controllerContext, ModelBindingContext bindingContext, PropertyDescriptor propertyDescriptor, IModelBinder propertyBinder) +35
System.Web.Mvc.DefaultModelBinder.BindProperty(ControllerContext controllerContext, ModelBindingContext bindingContext, PropertyDescriptor propertyDescriptor) +490
Castle.DynamicProxy.AbstractInvocation.Proceed() +106
Glimpse.Core.Extensions.AlternateMethodContextExtensions.TryProceedWithTimer(IAlternateMethodContext context, TimerResult& timerResult) +73
Glimpse.Core.Extensibility.AlternateMethod.NewImplementation(IAlternateMethodContext context) +32
Castle.DynamicProxy.AbstractInvocation.Proceed() +452
System.Web.Mvc.DefaultModelBinder.BindProperties(ControllerContext controllerContext, ModelBindingContext bindingContext) +164
System.Web.Mvc.DefaultModelBinder.BindComplexElementalModel(ControllerContext controllerContext, ModelBindingContext bindingContext, Object model) +64
System.Web.Mvc.DefaultModelBinder.BindComplexModel(ControllerContext controllerContext, ModelBindingContext bindingContext) +1942
Castle.Proxies.Invocations.DefaultModelBinder_BindModel.InvokeMethodOnTarget() +141
Castle.DynamicProxy.AbstractInvocation.Proceed() +106
Glimpse.Core.Extensions.AlternateMethodContextExtensions.TryProceedWithTimer(IAlternateMethodContext context, TimerResult& timerResult) +73
Glimpse.Core.Extensibility.AlternateMethod.NewImplementation(IAlternateMethodContext context) +32
Castle.DynamicProxy.AbstractInvocation.Proceed() +452
Castle.Proxies.DefaultModelBinderProxy.BindModel(ControllerContext controllerContext, ModelBindingContext bindingContext) +255
System.Web.Mvc.ControllerActionInvoker.GetParameterValue(ControllerContext controllerContext, ParameterDescriptor parameterDescriptor) +446
System.Web.Mvc.ControllerActionInvoker.GetParameterValues(ControllerContext controllerContext, ActionDescriptor actionDescriptor) +137
System.Web.Mvc.Async.<>c__DisplayClass3_1.<BeginInvokeAction>b__0(AsyncCallback asyncCallback, Object asyncState) +1082
System.Web.Mvc.Async.WrappedAsyncResultBase`1.Begin(AsyncCallback callback, Object state, Int32 timeout) +163
System.Web.Mvc.Async.AsyncControllerActionInvoker.BeginInvokeAction(ControllerContext controllerContext, String actionName, AsyncCallback callback, Object state) +463
System.Web.Mvc.<>c.<BeginExecuteCore>b__152_0(AsyncCallback asyncCallback, Object asyncState, ExecuteCoreState innerState) +48
System.Web.Mvc.Async.WrappedAsyncVoid`1.CallBeginDelegate(AsyncCallback callback, Object callbackState) +73
System.Web.Mvc.Async.WrappedAsyncResultBase`1.Begin(AsyncCallback callback, Object state, Int32 timeout) +163
System.Web.Mvc.Controller.BeginExecuteCore(AsyncCallback callback, Object state) +787
System.Web.Mvc.Async.WrappedAsyncResultBase`1.Begin(AsyncCallback callback, Object state, Int32 timeout) +163
System.Web.Mvc.Controller.BeginExecute(RequestContext requestContext, AsyncCallback callback, Object state) +630
System.Web.Mvc.<>c.<BeginProcessRequest>b__20_0(AsyncCallback asyncCallback, Object asyncState, ProcessRequestState innerState) +99
System.Web.Mvc.Async.WrappedAsyncVoid`1.CallBeginDelegate(AsyncCallback callback, Object callbackState) +73
System.Web.Mvc.Async.WrappedAsyncResultBase`1.Begin(AsyncCallback callback, Object state, Int32 timeout) +163
System.Web.Mvc.MvcHandler.BeginProcessRequest(HttpContextBase httpContext, AsyncCallback callback, Object state) +524
System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +1128
System.Web.HttpApplication.ExecuteStepImpl(IExecutionStep step) +220
System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +134

Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.8.4494.0