If you receive this error during a batch delete in Connexion client, it indicates that the holding on the referenced OCLC Control Number (OCN) has already been deleted by another user in the past. If multiple instances of this error occur, it may suggest that someone has already completed the task you are attempting, or alternatively, someone has deleted the holding just before you.
If the error occurs in a different context within Connexion client, please follow these steps:
Reach out to OCLC Support, providing the following details:
This information will assist OCLC Support in diagnosing and resolving the issue promptly.