The function that’s missing is from “the old API” of the crypto module, which was deprecated in OTP 23 and removed entirely in OTP 24. That version of cloak_ecto will not work on anything higher than OTP 23.
From the last couple posts in your previous thread on this issue, it sounded like migrating was going to be a lengthy, incremental process:
- upgrade to cloak 0.7 and do the data migration
- upgrade to 0.8 and 0.9 (minor config changes)
- THEN upgrade to Ecto 3 + 1.0, because of the changes in the type conversion machinery
- upgrade to 1.1 to get the fix for the functions removed in OTP 24
