An exception of type 'System.InvalidCastException' occurred in System.Data.dll but was not handled in user code

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LINQ

C#5.0

stored-procedure

Hi,

I get an error like this :
An exception of type 'System.InvalidCastException' occurred in System.Data.dll but was not handled in user code

Additional information: Specified cast is not valid.

this is my table structure:

Member table having columns: MemberID,MemberName,LoginPassword,MemberStatus

MemberLogin table having columns: MemberLoginID,MemberID,MemberLoginName

Team table having columns: TeamID,TeamName,TeamStatus

TeamMember table having columns :

TeamID,MemberLoginID,MemberRole,MemberJoinedDate,MemberLeftDate

and this is my storedprocedure for getting team member details based on TeamID

ALTER PROCEDURE [dbo].[uspGetAllTeamMembers](@TeamID INT)
AS
BEGIN
SELECT
 tm.TeamID,
m.MemberID,
m.MemberName,
m.MemberStatus,
ml.MemberLoginName,
ml.MemberLoginID,
tm.MemberJoinedDate,
tm.MemberLeftDate
FROM TeamMember tm
INNER JOIN MemberLogin ml
ON tm.MemberLoginID = ml.MemberLoginID
INNER JOIN Member m
ON m.MemberID = ml.MemberID
WHERE tm.TeamID = @TeamID
END

and this is my back-end code for getting TeamMember Details Based on TeamID:

public TeamMemberData GetAllTeamMembers(int teamID)
       {
           TeamMember getteammember = _DataContext.uspGetAllTeamMembers(teamID).SingleOrDefault();
           return new TeamMemberData { TeamID=getteammember.TeamID};

       }

But is shows an error
please help me