This is normal operation for non-mapper generated scripts. The Advantage Data Transformer Listener is telling you it cannot find the metadata for the script. Since the non-mapper generated scripts have no metadata the message is generated. The error is harmless and will not affect the scripts in any way.
The error in the Windows Event Viewer looks like this:
Date: mm/dd/yyyy Source: Advantage Data Transformer Listener
Time: hh:mm:ss Category: None
Type: information Event ID: 3
Computer: <computer Name>
Script <script Name> for Idb <System DSN name for Idb> not found.