The connection is not available for \" enableCallBack()

When I prepare SQL Server 2000 for webMethod6, I build an Adapter notification and get an error
[ART.116.3038] Adapter Runtime (Notification): Error in Notification Callback:enableCallback notification
acme.purchaseOrder.notifiers:OrderCanonicalNotifier.
[ADA.1.311] The connection is not available for “enableCallBack()”.