The error, The selected query to filter by does not exist, can appear when attempting to perform an export. This is caused by a query that has been deleted being used to filter within one of the output fields.
1. Click on the Output tab. 2. Review each Output field by highlighting them and clicking Change. 3. Check filters for the output field. 4. Review any queries used in filters in the fields. 5. Remove any queries that no longer exist. 6. Run Export again.