On Error Resume Next

My code works when the table is not found. But when the table is found it doesn't do the else part..Code:

Dim oConn
Dim oRs

Set oConn = Server.CreateObject("ADODB.Connection")
oConn.Open "Store_Form"
Set oRs = Server.CreateObject("ADODB.Recordset" )

elseif campo = "txtAN_GEN" then
on error resume next
Set oRs = oConn.Execute("SELECT * FROM 00_MOD48")
If err <> 0 then 'If table not found
GetFieldValue = "00001"
else
GetFieldValue = "150"
end if