Server Error in '/' Application.

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Line 43:         // then get the selcted event from publishing site if that dosn't exist 
Line 44:         //then show next upcioming event from current site 
Line 45:         objViewCONTENTBookingEventJoined = CContentBookingEvent.Instance().fn_getContentBookingEventBySiteId(CurrentSite.SiteID).ToList();
Line 46:         if (objViewCONTENTBookingEventJoined == null || objViewCONTENTBookingEventJoined.Count == 0)
Line 47:         {

[NotSupportedException: The specified LINQ expression contains references to queries that are associated with different contexts.]
   System.Data.Objects.ELinq.FuncletizingVisitor.InlineObjectQuery(ObjectQuery inlineQuery, Type expressionType) +254
   System.Data.Objects.ELinq.FuncletizingVisitor.InlineValue(Expression expression, Boolean recompileOnChange) +323
   System.Data.Objects.ELinq.FuncletizingVisitor.Visit(Expression exp) +187
   System.Linq.Expressions.EntityExpressionVisitor.VisitMethodCall(MethodCallExpression m) +43
   System.Data.Objects.ELinq.FuncletizingVisitor.Visit(Expression exp) +499
   System.Linq.Expressions.EntityExpressionVisitor.VisitExpressionList(ReadOnlyCollection`1 original) +167
   System.Linq.Expressions.EntityExpressionVisitor.VisitMethodCall(MethodCallExpression m) +76
   System.Data.Objects.ELinq.FuncletizingVisitor.Visit(Expression exp) +499
   System.Linq.Expressions.EntityExpressionVisitor.VisitExpressionList(ReadOnlyCollection`1 original) +167
   System.Linq.Expressions.EntityExpressionVisitor.VisitMethodCall(MethodCallExpression m) +76
   System.Data.Objects.ELinq.FuncletizingVisitor.Visit(Expression exp) +499
   System.Linq.Expressions.EntityExpressionVisitor.VisitExpressionList(ReadOnlyCollection`1 original) +167
   System.Linq.Expressions.EntityExpressionVisitor.VisitMethodCall(MethodCallExpression m) +76
   System.Data.Objects.ELinq.FuncletizingVisitor.Visit(Expression exp) +499
   System.Data.Objects.ELinq.Funcletizer.Funcletize(Expression expression, Func`1& recompileRequired) +213
   System.Data.Objects.ELinq.ELinqQueryState.CreateExpressionConverter() +173
   System.Data.Objects.ELinq.ELinqQueryState.GetExecutionPlan(Nullable`1 forMergeOption) +273
   System.Data.Objects.ObjectQuery`1.GetResults(Nullable`1 forMergeOption) +11120473
   System.Data.Objects.ObjectQuery`1.System.Collections.Generic.IEnumerable<T>.GetEnumerator() +47
   System.Collections.Generic.List`1..ctor(IEnumerable`1 collection) +382
   System.Linq.Enumerable.ToList(IEnumerable`1 source) +80
   ML.DAL.CContentBookingEvent.fn_getContentBookingEventBySiteId(Int32 SiteID) in C:\tfs\Release\ML.DAL\Implementation\CContentBookingEvent.cs:91
   CMSWebParts_MLCustomWebParts_ComingEvent_NextEventCustomWebPart.BindComingEventsDatalist(Int32 iSiteId) in c:\Project\Solution\ml\CMSWebParts\MLCustomWebParts\ComingEvent\NextEventCustomWebPart.ascx.cs:45
   CMSWebParts_MLCustomWebParts_ComingEvent_NextEventCustomWebPart.Page_Load(Object sender, EventArgs e) in c:\Project\Solution\ml\CMSWebParts\MLCustomWebParts\ComingEvent\NextEventCustomWebPart.ascx.cs:30
   System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e) +25
   CMS.PortalControls.CMSAbstractWebPart.OnLoad(EventArgs e) +248
   System.Web.UI.Control.LoadRecursive() +71
   System.Web.UI.Control.LoadRecursive() +190
   System.Web.UI.Control.LoadRecursive() +190
   System.Web.UI.Control.LoadRecursive() +190
   System.Web.UI.Control.LoadRecursive() +190
   System.Web.UI.Control.LoadRecursive() +190
   System.Web.UI.Control.LoadRecursive() +190
   System.Web.UI.Control.LoadRecursive() +190
   System.Web.UI.Control.LoadRecursive() +190
   System.Web.UI.Control.LoadRecursive() +190
   System.Web.UI.Control.LoadRecursive() +190
   System.Web.UI.Control.LoadRecursive() +190
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +3064