[InvalidOperationException: Sequence contains more than one element]
System.Linq.Enumerable.SingleOrDefault(IEnumerable`1 source) +348
BLToolkit.Data.Linq.ExpressionInfo`1.<MakeElementOperator>b__43(QueryContext ctx, IDataContextInfo db, Expression expr, Object[] ps) +49
BLToolkit.Data.Linq.Table`1.System.Linq.IQueryProvider.Execute(Expression expression) +70
System.Linq.Queryable.SingleOrDefault(IQueryable`1 source) +211
MainBL.<>c__DisplayClass2_0.<GetSpeaker>b__0(SpeakerDbManager context) in C:\dev\aishaudio.com\Repository-for-Aishaudio.com-Code\AishAudio\ClassLibraries.BL\MainBL\SpeakerService.cs:58
MyPartnerKinoBL.BLToolkitExtension.Exec(Td db_manager, Func`2 func, IsolationLevel transaction_level) in C:\dev\aishaudio.com\Repository-for-Aishaudio.com-Code\AishAudio\ClassLibraries.Common\MainCommon\Extension\BLToolkitExtension.cs:22
MyPartnerKinoBL.Extension.BaseBO.Exec(IsolationLevel transaction_level, Func`2 func) in C:\dev\aishaudio.com\Repository-for-Aishaudio.com-Code\AishAudio\ClassLibraries.Common\MainCommon\Extension\BaseBO.cs:41
MainBL.SpeakerService.GetSpeaker(String name) in C:\dev\aishaudio.com\Repository-for-Aishaudio.com-Code\AishAudio\ClassLibraries.BL\MainBL\SpeakerService.cs:55
Main.Controllers.SearchController.ResultsDetail(Int32 p, Int32 ps, Int32 rn, String cat, String words, String code, String title, String id, String speaker, Int64 class, String category, Boolean cd, Boolean mp3, Boolean tape, Nullable`1 sort, Boolean filter, String cat_equals, Int32 level, Int32 additional) in C:\dev\aishaudio.com\Repository-for-Aishaudio.com-Code\AishAudio\Web\AishAudioMain\Main\Controllers\SearchController.cs:214
lambda_method(Closure , ControllerBase , Object[] ) +870
System.Web.Mvc.ActionMethodDispatcher.Execute(ControllerBase controller, Object[] parameters) +14
System.Web.Mvc.ReflectedActionDescriptor.Execute(ControllerContext controllerContext, IDictionary`2 parameters) +182
System.Web.Mvc.ControllerActionInvoker.InvokeActionMethod(ControllerContext controllerContext, ActionDescriptor actionDescriptor, IDictionary`2 parameters) +27
System.Web.Mvc.Async.<>c__DisplayClass42.<BeginInvokeSynchronousActionMethod>b__41() +28
System.Web.Mvc.Async.<>c__DisplayClass8`1.<BeginSynchronous>b__7(IAsyncResult _) +10
System.Web.Mvc.Async.WrappedAsyncResult`1.End() +50
System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeActionMethod(IAsyncResult asyncResult) +32
System.Web.Mvc.Async.<>c__DisplayClass39.<BeginInvokeActionMethodWithFilters>b__33() +58
System.Web.Mvc.Async.<>c__DisplayClass4f.<InvokeActionMethodFilterAsynchronously>b__49() +228
System.Web.Mvc.Async.<>c__DisplayClass37.<BeginInvokeActionMethodWithFilters>b__36(IAsyncResult asyncResult) +10
System.Web.Mvc.Async.WrappedAsyncResult`1.End() +50
System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeActionMethodWithFilters(IAsyncResult asyncResult) +34
System.Web.Mvc.Async.<>c__DisplayClass2a.<BeginInvokeAction>b__20() +24
System.Web.Mvc.Async.<>c__DisplayClass25.<BeginInvokeAction>b__22(IAsyncResult asyncResult) +99
System.Web.Mvc.Async.WrappedAsyncResult`1.End() +50
System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeAction(IAsyncResult asyncResult) +27
System.Web.Mvc.<>c__DisplayClass1d.<BeginExecuteCore>b__18(IAsyncResult asyncResult) +14
System.Web.Mvc.Async.<>c__DisplayClass4.<MakeVoidDelegate>b__3(IAsyncResult ar) +16
System.Web.Mvc.Async.WrappedAsyncResult`1.End() +50
System.Web.Mvc.Controller.EndExecuteCore(IAsyncResult asyncResult) +36
System.Web.Mvc.Async.<>c__DisplayClass4.<MakeVoidDelegate>b__3(IAsyncResult ar) +16
System.Web.Mvc.Async.WrappedAsyncResult`1.End() +50
System.Web.Mvc.Controller.EndExecute(IAsyncResult asyncResult) +26
System.Web.Mvc.Controller.System.Web.Mvc.Async.IAsyncController.EndExecute(IAsyncResult asyncResult) +10
System.Web.Mvc.<>c__DisplayClass8.<BeginProcessRequest>b__3(IAsyncResult asyncResult) +25
System.Web.Mvc.Async.<>c__DisplayClass4.<MakeVoidDelegate>b__3(IAsyncResult ar) +16
System.Web.Mvc.Async.WrappedAsyncResult`1.End() +50
System.Web.Mvc.MvcHandler.EndProcessRequest(IAsyncResult asyncResult) +28
System.Web.Mvc.MvcHandler.System.Web.IHttpAsyncHandler.EndProcessRequest(IAsyncResult result) +9
System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +9875181
System.Web.HttpApplication.ExecuteStepImpl(IExecutionStep step) +48
System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +159
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