ElixirLS stopped working: "Unable to find formatter"

Just adding in I had this for weeks on latest version of ElixirLS (0.23.1). Elixir 1.17.2, OTP 27. Tried installing older versions, uninstalling, reinstalling. Nothing worked. Eventually I uninstalled, trashed the .elixir_ls folder, reinstalled an older version and then upgraded Elixir LS and it worked!

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