** (CompileError) lib/sqids/alphabet.ex:106: undefined function then/2

Process completed with exit code 1.

module Mix.Tasks.Format is not a behaviour (in module Styler)

got "@impl Mix.Tasks.Format" for function features/1 but this behaviour does not specify such callback. There are no known callbacks, please specify the proper @behaviour and make sure it defines callbacks

got "@impl Mix.Tasks.Format" for function format/3 but this behaviour does not specify such callback. There are no known callbacks, please specify the proper @behaviour and make sure it defines callbacks