Elixir-ls error: {:error, already_present}

Questions / Help
1

Hi,

I am attempting to use the elixir-ls for neovim. I get this error when the language server is trying to start up:

[WARN][2023-06-04 16:07:54] ...lsp/handlers.lua:537	"** (MatchError) no match of right hand side value: {:error, :already_present}\n    lib/language_server/cli.ex:20: ElixirLS.LanguageServer.CLI.main/0\n    nofile:1: (file)\n    (stdlib 4.3.1.1) erl_eval.erl:748: :erl_eval.do_apply/7\n    (elixir 1.15.0-rc.1) lib/code.ex:543: Code.validated_eval_string/3"

I am using:
Elixir 1.15.0-rc.0 (3cdb388) (compiled with Erlang/OTP 24)
Erlang/OTP 24 [erts-12.3.2.12] [source] [64-bit] [smp:16:16] [ds:16:16:10]

I have tried using OTP 25 and I got the same issue.

This is the match that fails in cli.ex:

    {:ok, _} = Logger.add_backend(Logger.Backends.JsonRpc)

I’m not very savvy with language servers or elixir, and can’t work out why this is occuring. I thought maybe it’s because there shouldn’t be multiple servers up at the same time but when I load up ubuntu fresh and run language_server.sh from bash I get the same error.

Any ideas?

Thanks

2

Solved.

My bad, I installed all of the dependencies listed on the asdf erlang repo and then the ls started working.

3

Elixir 1.15 is not yet supported by elixirLS. We generally do not support not released versions. Please use 1.14 or wait for a next release

1 Like
4

Do we need to wait for a full release of 1.15 before using this fix? Race conditions in SourceFile.formatter_opts · Issue #402 · elixir-lsp/elixir-ls · GitHub