Compare Values Of Columns Within The Same Query Table

Hi,
I am trying to compare two columns' values within the same QUERY table, but I kept on getting the "Data type mismatch in criteria expression" error. What am I doing wrong?

Here is my Select Query Statement:
SELECT qryDedparmDedetail.EMP_ID, qryDedparmDedetail.[Employer Amt], qryDedparmDedetail.[Employer Actl], qryDedparmDedetail.[Admin Amt], qryDedparmDedetail.[Admin Actl], qryDedparmDedetail.[Employee Actl], qryDedparmDedetail.[Employee Amt], qryDedparmDedetail.FirstOfSTATUS, qryDedparmDedetail.FirstOfAGENCY, qryDedparmDedetail.FirstOfTITLE, qryDedparmDedetail.FirstOfFORMAT_NM, qryDedparmDedetail.RepUnit, qryDedparmDedetail.FirstOfDEDTYPE_CD1 AS Expr1, qryDedparmDedetail.SumOfNBR, RepUnit.REPUNITDESC, qryDedparmDedetail.LeftType
FROM qryDedparmDedetail LEFT JOIN RepUnit ON qryDedparmDedetail.RepUnit = RepUnit.REPUNIT
WHERE (((qryDedparmDedetail.[Employer Amt])<>"Employer Actl") AND ((qryDedparmDedetail.LeftType)="01"));