You are getting this message because the recordset you are using is a forward only recordset. From what I have read this has to do with the cursor type that is used in establishing the connection. Since DW is creating the recordset for you I think it would be best to work around this by using two different recordsets on the page. They will have the same query and filtering applied to both of them so the results that you get from both will be the same. However, since you can only move forward with the recordsets you will use one in the map (rsGetRetailers) and the second for the display on the page.
To make sure that you do not get this error message you will need to remove the code that is on line 268 in the wagmp_map_1.asp file:
<% rsGetRetailers.MoveFirst() %>