Query failed during execution. Error: Invalid object name _Open_unfiltered._Open_unfiltered or other Data Views with the same error message eg. _Sent_unfiltered, __Bounce_unfiltered, or _Click_unfiltered is a known SFMC error.
This SFMC error is caused by a related SFMC system error. To get around this error, DESelect can help you by creating an alias for the Data Views removing the underscore (_) eg. _Open with Open:
- Go to the Selection Criteria step
- Click on the name of the Selected Data Extension - in this case “ _Open”
- Provide the alias in the modal that appears- in this case “Open”
- Run the Selection.
In case the issue is still not resolved, you need to contact Create a support ticket with Salesforce.