Starting from 8.2.2, you can click on the "job", then "inspect job", then click on "search log" Do "Ctrl" Find; and type in "reference cycle", copy the highlighted texts into a notepad, and you can see the problematic lookup. You also do not need to re-save this lookup (It is the Automatic Lookup in most cases). The problem is because the Lookup input field and Lookup output field has blank fields. Delete these blanks (Click on the Automatic Lookup name, and then delete the blank field line under lookup input fields and lookup output field) and click save. It should be resolved.
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