Index tag is not found?

SELECT a_arcadr
GOTO top
IF SEEK (ALLTRIM(thisform.combo1.Text),"a_arcadr","cshipno") = .T.
thisform.scompany.Value = company
thisform.saddress1.Value = address1
thisform.saddress2.Value = address2
thisform.scity.Value = city
thisform.sstate.Value = state
thisform.szip.Value = zip
ELSE
WAIT WINDOW "customer address not found"
ENDIF