Lỗi xảy ra ở Module: Other, View: LinkWebsite, Section: ContentRight

System.Data.MappingException: The type 'CTS.Base.Category' has been mapped more than once. at System.Data.Mapping.DefaultObjectMappingItemCollection.AddInternalMapping(ObjectTypeMapping objectMap) at System.Data.Mapping.DefaultObjectMappingItemCollection.LoadObjectMapping(EdmType cdmType, EdmType objectType, DefaultObjectMappingItemCollection ocItemCollection) at System.Data.Mapping.DefaultObjectMappingItemCollection.TryGetMap(String identity, DataSpace typeSpace, Boolean ignoreCase, Map& map) at System.Data.Mapping.DefaultObjectMappingItemCollection.TryGetMap(String identity, DataSpace typeSpace, Map& map) at System.Data.Metadata.Edm.MetadataWorkspace.TryGetObjectSpaceType[T](T edmSpaceType, T& objectSpaceType) at System.Data.Metadata.Edm.MetadataWorkspace.GetObjectSpaceType[T](T edmSpaceType) at System.Data.Entity.Internal.InternalContext.UpdateEntitySetMappings() at System.Data.Entity.Internal.InternalContext.TryUpdateEntitySetMappingsForType(Type entityType) at System.Data.Entity.Internal.InternalContext.UpdateEntitySetMappingsForType(Type entityType) at System.Data.Entity.Internal.InternalContext.GetEntitySetAndBaseTypeForType(Type entityType) at System.Data.Entity.Internal.Linq.InternalSet`1.Initialize() at System.Data.Entity.Internal.Linq.InternalSet`1.get_InternalContext() at System.Data.Entity.Infrastructure.DbQuery`1.System.Linq.IQueryable.get_Provider() at System.Linq.Queryable.Where[TSource](IQueryable`1 source, Expression`1 predicate) at Other.Models.LinkWebsiteDl.GetAllListSimple() in D:\SETUPS\Ha Long\halong\Code\CTS.Web\Areas\Other\Models\LinkWebsiteDL.cs:line 29 at Other.Models.LinkWebsiteBL.GetAllListSimple() in D:\SETUPS\Ha Long\halong\Code\CTS.Web\Areas\Other\Models\LinkWebsiteBL.cs:line 30 at Other.Controllers.OtherController.LinkWebsite() in D:\SETUPS\Ha Long\halong\Code\CTS.Web\Areas\Other\Controllers\OtherController.cs:line 202 at lambda_method(Closure , ControllerBase , Object[] ) at System.Web.Mvc.ReflectedActionDescriptor.Execute(ControllerContext controllerContext, IDictionary`2 parameters) at System.Web.Mvc.ControllerActionInvoker.InvokeActionMethod(ControllerContext controllerContext, ActionDescriptor actionDescriptor, IDictionary`2 parameters) at System.Web.Mvc.Async.AsyncControllerActionInvoker.<>c__DisplayClass42.b__41() at System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeActionMethod(IAsyncResult asyncResult) at System.Web.Mvc.Async.AsyncControllerActionInvoker.<>c__DisplayClass37.<>c__DisplayClass39.b__33() at System.Web.Mvc.Async.AsyncControllerActionInvoker.<>c__DisplayClass4f.b__49() at System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeActionMethodWithFilters(IAsyncResult asyncResult) at System.Web.Mvc.Async.AsyncControllerActionInvoker.<>c__DisplayClass25.<>c__DisplayClass2a.b__20() at System.Web.Mvc.Async.AsyncControllerActionInvoker.<>c__DisplayClass25.b__22(IAsyncResult asyncResult) at System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeAction(IAsyncResult asyncResult) at System.Web.Mvc.Controller.<>c__DisplayClass1d.b__18(IAsyncResult asyncResult) at System.Web.Mvc.Async.AsyncResultWrapper.<>c__DisplayClass4.b__3(IAsyncResult ar) at System.Web.Mvc.Controller.EndExecuteCore(IAsyncResult asyncResult) at System.Web.Mvc.Async.AsyncResultWrapper.<>c__DisplayClass4.b__3(IAsyncResult ar) at System.Web.Mvc.Controller.EndExecute(IAsyncResult asyncResult) at System.Web.Mvc.MvcHandler.<>c__DisplayClass8.b__3(IAsyncResult asyncResult) at System.Web.Mvc.Async.AsyncResultWrapper.<>c__DisplayClass4.b__3(IAsyncResult ar) at System.Web.Mvc.MvcHandler.EndProcessRequest(IAsyncResult asyncResult) at System.Web.Mvc.HttpHandlerUtil.ServerExecuteHttpHandlerWrapper.<>c__DisplayClass4.b__3() at System.Web.Mvc.HttpHandlerUtil.ServerExecuteHttpHandlerWrapper.Wrap[TResult](Func`1 func) at System.Web.HttpServerUtility.ExecuteInternal(IHttpHandler handler, TextWriter writer, Boolean preserveForm, Boolean setPreviousPage, VirtualPath path, VirtualPath filePath, String physPath, Exception error, String queryStringOverride)