CRm Dynamics 2013插件错误，请求xxx类型的权限失败

我有一个CRM插件，它在更新表单上的字段时启动，然后插件应该利用SDK的导入功能将CSV记录导入Dynamics，我得到以下错误

请求类型的权限'System.Security.Permissions.FileIOPermission，mscorlib，版本=4.0.0.0，区域性=中性，PublicKeyToken=b77a5c561934e089'失败。

我已经在隔离模式下注册了插件，设置为NONE，而不是Sandbox，但我仍然收到了错误，关于为什么会发生这种情况以及如何解决它的任何想法。它在ImportData函数中封装的ImportFile部分失败。

请参阅下方的插件代码

public void Execute(IServiceProvider serviceProvider)
    {
        ITracingService tracingService = (ITracingService)serviceProvider.GetService(typeof(ITracingService));
        IPluginExecutionContext context = (IPluginExecutionContext)serviceProvider.GetService(typeof(IPluginExecutionContext));
        if (context == null)
        {
            throw new ArgumentNullException("loaclContext");
        }
        if (context.InputParameters.Contains("Target") && context.InputParameters["Target"] is Entity)
        {
            Entity supplyClaimsEntity = (Entity)context.InputParameters["Target"];
            if (supplyClaimsEntity.LogicalName != "new_supplierclaimsupdate")
            {
                return;
            }
            IOrganizationServiceFactory serviceFactory = (IOrganizationServiceFactory)serviceProvider.GetService(typeof(IOrganizationServiceFactory));
            IOrganizationService service = serviceFactory.CreateOrganizationService(context.InitiatingUserId);
            string entityBeginUpload = "Start Upload";
            try
            {
                string filePath = (@"C:'Team CRM'Warp.csv");
                ImportData(service, new_topproducts.EntityLogicalName, filePath);
            }
            catch (FaultException<Microsoft.Xrm.Sdk.OrganizationServiceFault> ex)
            {
                Console.WriteLine("The application terminated with an error.");
                Console.WriteLine("Timestamp: {0}", ex.Detail.Timestamp);
                Console.WriteLine("Code: {0}", ex.Detail.ErrorCode);
                Console.WriteLine("Message: {0}", ex.Detail.Message);
                Console.WriteLine("Inner Fault: {0}",
                    null == ex.Detail.InnerFault ? "No Inner Fault" : "Has Inner Fault");
            }
            catch (System.TimeoutException ex)
            {
                Console.WriteLine("The application terminated with an error.");
                Console.WriteLine("Message: {0}", ex.Message);
                Console.WriteLine("Stack Trace: {0}", ex.StackTrace);
                Console.WriteLine("Inner Fault: {0}",
                    null == ex.InnerException.Message ? "No Inner Fault" : ex.InnerException.Message);
            }
            catch (System.Exception ex)
            {
                Console.WriteLine("The application terminated with an error.");
                Console.WriteLine(ex.Message);
                // Display the details of the inner exception.
                if (ex.InnerException != null)
                {
                    Console.WriteLine(ex.InnerException.Message);
                    FaultException<Microsoft.Xrm.Sdk.OrganizationServiceFault> fe = ex.InnerException
                        as FaultException<Microsoft.Xrm.Sdk.OrganizationServiceFault>;
                    if (fe != null)
                    {
                        Console.WriteLine("Timestamp: {0}", fe.Detail.Timestamp);
                        Console.WriteLine("Code: {0}", fe.Detail.ErrorCode);
                        Console.WriteLine("Message: {0}", fe.Detail.Message);
                        Console.WriteLine("Trace: {0}", fe.Detail.TraceText);
                        Console.WriteLine("Inner Fault: {0}",
                            null == fe.Detail.InnerFault ? "No Inner Fault" : "Has Inner Fault");
                    }
                }
            }