Server Error in '/' Application.

Sequence contains more than one element

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.InvalidOperationException: Sequence contains more than one element

Source Error:


Line 30:             
Line 31: 
Line 32:             var Me2 = (from r in db.SubGroups
Line 33:                        where (r.Group.Title == GI)
Line 34:                        select r).SingleOrDefault();

Source File: d:\hostingspaces\cargo1.ir\raspid.ir\Book.aspx.cs    Line: 32

Stack Trace:


[InvalidOperationException: Sequence contains more than one element]
   System.Linq.Enumerable.SingleOrDefault(IEnumerable`1 source) +470
   Book.Page_Load(Object sender, EventArgs e) in d:\hostingspaces\cargo1.ir\raspid.ir\Book.aspx.cs:32
   System.Web.UI.Control.OnLoad(EventArgs e) +108
   System.Web.UI.Control.LoadRecursive() +90
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1533


Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.8.4700.0