Arguments_are_of_the_wrong_type_are_out_of_acceptable_range_or_are_in_conflict_with_o

I am getting Arguments_are_of_the_wrong_type_are_out_of_acceptable_range_or_are_in_conflict_with_one_another

on rstUpload.Open strSQL, Application("gstrDbConnProp"), 1,3


and I have no idea why


Set rstUpload = Server.CreateObject("adodb.recordset")
rstUpload.Open strSQL, Application("gstrDbConnProp"), 1,3


It looks perfectly ok to me. Ha sanyone got any pdeas whyc please?

Thanks