You are on an older version of Rustler (0.22.2) where the mix rustler.new task appears incompatible with Elixir 1.13. See the changelog, specifically a fix in 0.23.0
Assuming you’re on Elixir 1.13, if you upgrade Rustler in your mix.exs {:rustler, "~> 0.25.0"} and run mix deps.update --all, then it should work
what version of sorted_set_nif are you on? I just did a fresh install of 1.0.0 and Rustler 0.25.0 was installed. the latest version is 1.2.0 so perhaps update your mix.exs with {:sorted_set_nif, "~> 1.2"} and run mix deps.update sorted_set_nif rustler
If upgrading the dependency doesn’t work then downgrading Elixir to 1.12 will
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