Cause:

The listener received a request to establish a connection to a
  database or other service. The connect descriptor received by the listener
  specified a service name for a service (usually a database service) that
  either has not yet dynamically registered with the listener or has not been
  statically configured for the listener. This may be a temporary condition
  such as after the listener has started, but before the database instance has
  registered with the listener.

Action:

- Wait a moment and try to connect a second
  time.

- Check which services are currently known
  by the listener by executing: lsnrctl services <listener name>

- Check that the SERVICE_NAME parameter in
  the connect descriptor of the net service name used specifies a service known
  by the listener.

- If an easy connect naming connect
  identifier was used, check that the service name specified is a service known
  by the listener.

- Check for an event in the listener.log
  file.