Destination Folder unavailable

I have a simple rule that watches a folder for pdf's, scans and ocr's them and moves them to another folder. I keep getting this error
I have deleted the rule from that folder, reapplied it and reselected the folder and still get the same error. I also tried stopping the hazel helper and rebooting. Other people have had the problem and the advice was for them to reset the folder. Sorry, I am not sure what is meant by resetting the folder?
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2018-10-05 15:06:18.421 hazelworker[716] [Error] Move failed: Destination folder /inbox/ocrs is unavailable. Will try again later.
I have deleted the rule from that folder, reapplied it and reselected the folder and still get the same error. I also tried stopping the hazel helper and rebooting. Other people have had the problem and the advice was for them to reset the folder. Sorry, I am not sure what is meant by resetting the folder?