I have following trace:
Please check why this error occured, thanks in advance...
[Win32Exception (0x80004005): The wait operation timed out]
[SqlException (0x80131904): Timeout expired. The timeout period elapsed prior to completion of the operation or the server is not responding.]
System.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection, Action`1 wrapCloseInAction) +3242916
System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj, Boolean callerHasConnectionLock, Boolean asyncClose) +345
System.Data.SqlClient.TdsParser.TryRun(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj, Boolean& dataReady) +4927
System.Data.SqlClient.SqlDataReader.TryConsumeMetaData() +92
System.Data.SqlClient.SqlDataReader.get_MetaData() +102
System.Data.SqlClient.SqlCommand.FinishExecuteReader(SqlDataReader ds, RunBehavior runBehavior, String resetOptionsString) +552
System.Data.SqlClient.SqlCommand.RunExecuteReaderTds(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, Boolean async, Int32 timeout, Task& task, Boolean asyncWrite, SqlDataReader ds, Boolean describeParameterEncryptionRequest) +3140
System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method, TaskCompletionSource`1 completion, Int32 timeout, Task& task, Boolean asyncWrite) +554
System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method) +98
System.Data.SqlClient.SqlCommand.ExecuteReader(CommandBehavior behavior, String method) +307
System.Data.EntityClient.EntityCommandDefinition.ExecuteStoreCommands(EntityCommand entityCommand, CommandBehavior behavior) +472
[EntityCommandExecutionException: An error occurred while executing the command definition. See the inner exception for details.]
System.Data.EntityClient.EntityCommandDefinition.ExecuteStoreCommands(EntityCommand entityCommand, CommandBehavior behavior) +665
System.Data.Objects.Internal.ObjectQueryExecutionPlan.Execute(ObjectContext context, ObjectParameterCollection parameterValues) +932
System.Data.Objects.ObjectQuery`1.GetResults(Nullable`1 forMergeOption) +213
System.Data.Objects.ObjectQuery`1.System.Collections.Generic.IEnumerable<T>.GetEnumerator() +41
System.Collections.Generic.List`1..ctor(IEnumerable`1 collection) +432
System.Linq.Enumerable.ToList(IEnumerable`1 source) +70
Nop.Services.Common.<>c__DisplayClass1.<GetAttributesForEntity>b__0() +474
Nop.Core.Caching.CacheExtensions.Get(ICacheManager cacheManager, String key, Int32 cacheTime, Func`1 acquire) +135
Nop.Services.Common.GenericAttributeService.GetAttributesForEntity(Int32 entityId, String keyGroup) +332
Nop.Services.Common.GenericAttributeExtentions.GetAttribute(BaseEntity entity, String key, IGenericAttributeService genericAttributeService) +171
Nop.Web.Framework.StoreLastVisitedPageAttribute.OnActionExecuting(ActionExecutingContext filterContext) +544
System.Web.Mvc.ControllerActionInvoker.InvokeActionMethodFilter(IActionFilter filter, ActionExecutingContext preContext, Func`1 continuation) +48
System.Web.Mvc.ControllerActionInvoker.InvokeActionMethodFilter(IActionFilter filter, ActionExecutingContext preContext, Func`1 continuation) +432
System.Web.Mvc.ControllerActionInvoker.InvokeActionMethodFilter(IActionFilter filter, ActionExecutingContext preContext, Func`1 continuation) +432
System.Web.Mvc.ControllerActionInvoker.InvokeActionMethodFilter(IActionFilter filter, ActionExecutingContext preContext, Func`1 continuation) +432
System.Web.Mvc.ControllerActionInvoker.InvokeAction(ControllerContext controllerContext, String actionName) +637
System.Web.Mvc.Controller.ExecuteCore() +141
System.Web.Mvc.ControllerBase.Execute(RequestContext requestContext) +92
System.Web.Mvc.<>c__DisplayClassb.<BeginProcessRequest>b__5() +55
System.Web.Mvc.Async.<>c__DisplayClass1.<MakeVoidDelegate>b__0() +22
System.Web.Mvc.<>c__DisplayClasse.<EndProcessRequest>b__d() +54
System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +611
System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +137