no value given for one or more parameters error

I have tried everything to solve this, and am lost at this point.
The error is: no value given for one or more parameters

The sql query is simple:

strsqlHor1 = "Select * from HorData where [User Number] = " & UNumber & _
" and [Location Number] = " & LNumber & " Order by Azimuth, Altitude"

It evaluates to
Select * from HorData where [User Number] = 1 and [Location Number] = 1 Order by Azimuth, Altitude

The HorData table has the two columns, spelled correctly. User and Location number 1 is there. So is Azimuth and Altitude and there are no null entries.

If I copy the sql from the vb6 program and run it in the database, it runs perfectly, no errors.

The database is passworded, and the connection string is:
PROVIDER=Microsoft.Jet.OLEDB.4.0;Data Source=C:\Program Files\AHC\AHCData.mdb;Jet OLEDB:Database Password="nuIynhrV6HV8"

I am using VB6 and the ADOdc data control. Any help would be extremely appreciated as it has us at a halt at this point.

Bruce