Destination folder ... is unavailable. Will try again later.

After upgrading from 4.x to 5.01 I receive the message Destination folder ... is unavailable. Will try again later.

Update: this seems to be occurring with old 4.x rules. A new rule to move a file to my desktop worked fine.

Double-check the destination folder. If you made any changes to it, Hazel may have lost track of it and you will need to reset it.