how solve this problem in linq

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SQL

LINQ

ASP.NET4

hi
I am getting this error
"The data reader returned by the store data provider does not have enough columns for the query requested."

alter Procedure  [dbo].[P_poll_Get_checkpolluser]
( 
   @user      varchar(100),
   @Result    int output
)
   AS
Begin
	 SELECT @Result=Count(*)  from
						( SELECT  FCourseExeID
							 from VDB_CoursRegisterAll   
								where FUserName=@user and FMark >= FMinmark   and  FCourseExeID	  in(select FCourseExeID from [dbo].[TEvalSetting] where FISEnabled =1) 
							 EXCEPT
						SELECT  FCourseExeID
							 from [dbo].[TEvalScores]
							where FUserName=@user  ) as k
							
			 
RETURN  @Result
end

  using (Hrst context = new Hrst())
                {
                    ObjectParameter parameter = new ObjectParameter("Result", typeof(int?));
                    var q = context.P_poll_Get_checkpolluser(user, parameter).First();
                 
                    if(Convert.ToInt32(parameter.Value.ToString()) > 0)
                    {}
}