PB 12.5 Soap Connection, Bad Runtime Function Reference

I am getting a Bad Runtime Function Reference when calling createInstance method on a Soap Connection:

try

SoapConnection conn

conn = create SoapConnection

conn.createInstance (lnv_webservice, 'canonicserviceforapmessage')

it is working fine in my Development environment, but when i build the application and run on another windows 7 64 bit PC, i get the error.   We are using both a Windows 7 32 but and 64 bit machines for our development.   i think the issue is with dlls.    does anyone know what dlls are required to make the Soap Connection work.

thanks

Jim