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If your term does not appear to be “Used by” any other records, but you are getting this message, it is likely that records using this term were “soft deleted” at some point. These records no longer show up in the application, but still exist in the underlying data used by the services API. Contact your CollectionSpace admin support and ask them to check for and delete from the database any soft deleted records using the term you wish to delete.
ERROR: No processed data found. Processed record may have expired from cache, in which case you need to start over with the batch.
As described in the Known issues/limitations documentation, processed records are only kept in memory in the CSV Importer for a day.
This indicates there are no longer any records to be transferred to CollectionSpace because too much time has elapsed between processing and attempting to transfer. You will need to start over, reprocess the batch, and transfer the processed records more promptly.