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Cohort Diagnostics package (v. 2.2.4): assertion error

We’ve been using the Cohort Diagnostics package version 2.2.4 for a while now without any issue. Yesterday I ran into this very “vague” error:

To test if it is the definition or not, I ran again with an old definition which worked 3 weeks ago. The same error popped up.

I wonder if any of you had this before? I appreciate any clues.

Many thanks.