Try changing your repository from Melpa to Melpa-stable:
(add-to-list 'package-archives
'("melpa-stable" . "https://stable.melpa.org/packages/";) t)
I had a similar problem after a recent update of ESS in MELPA, but
after I deleted ESS and reinstalled from melpa-stable, everything
worked just fine.
--
Woody Setzer
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