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I am getting this error randomly at the production server here is the stack trace of the error. I am using linq to sql and .net 4.0 System.ArgumentException: An item with the same key has already been added. at System.ThrowHelper.ThrowArgumentException(ExceptionResource resource) at System.Collections.Generic.Dictionary`2.Insert(TKey key, TValue value, Boolean add) at System.Data.Linq.DataContext.GetTable(MetaTable metaTable) at System.Data.Linq.DataContext.GetTable[TEntity]() at UserManagement.Models.EvoletDataContext.get_sysModules() in D:\MyProj\Models\datamdl.designer.cs:line 1294 at UserManagement.Models.FilterRepository.GetModuleHead(String actionName) in D:\MyProj\Models\FilterRepository.cs:line 14 at UserManagement.Models.DummyAttrib.OnAuthorization(AuthorizationContext filterContext) in D:\MyProj\Models\Filters.cs:line 44 at Glimpse.Net.Plumbing.GlimpseAuthorizationFilter.OnAuthorization(AuthorizationContext filterContext) at System.Web.Mvc.ControllerActionInvoker.InvokeAuthorizationFilters(ControllerContext controllerContext, IList`1 filters, ActionDescriptor actionDescriptor) at System.Web.Mvc.ControllerActionInvoker.InvokeAction(ControllerContext controllerContext, String actionName) at System.Web.Mvc.Controller.ExecuteCore() at System.Web.Mvc.ControllerBase.Execute(RequestContext requestContext) at System.Web.Mvc.ControllerBase.System.Web.Mvc.IController.Execute(RequestContext requestContext) at System.Web.Mvc.MvcHandler.<>c__DisplayClass6.<>c__DisplayClassb.<BeginProcessRequest>b__5() at System.Web.Mvc.Async.AsyncResultWrapper.<>c__DisplayClass1.<MakeVoidDelegate>b__0() at System.Web.Mvc.Async.AsyncResultWrapper.<>c__DisplayClass8`1.<BeginSynchronous>b__7(IAsyncResult _) at System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncResult`1.End() at System.Web.Mvc.MvcHandler.<>c__DisplayClasse.<EndProcessRequest>b__d() at System.We

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