Linq query error

Question

var quer=(from dh in Deal_BlendedIncomeHeaders 

join dd in Deal_BlendedIncomeDetails 

    on dh.BlendedHeaderID equals dd.BlendedHeaderID 

join a in AdminFee_Earneds

on new {dd.BlendedDetailID,IsActive=1} equals new {a.BlendedDetailID,a.IsActive} into temp

from t in temp.DefaultIfEmpty()

select new {

dh.BlendedHeaderID

,dd.BlendedIncomeName

,dd.Amount

,AdminFeeEarnedID =(int?)t.AdminFeeEarnedID

}).Dump();

The type of one of the expressions in the join clause is incorrect. Type inference failed in the call to 'GroupJoin'. Getting this error in query