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Basic troubleshooting steps:

  • Restart your editor (which will restart ElixirLS)
  • After stopping your editor, remove the entire .elixir_ls directory, then restart your editor
  • NOTE: This will cause you to have to re-run the entire dialyzer build

If your code doesn't compile in ElixirLS, it may be because ElixirLS compiles code with MIX_ENV=test (by default). So if you are missing some configuration in the test environment, your code may not compile.

If you get an error like the following immediately on startup:

[Warn  - 1:56:04 PM] ** (exit) exited in:, {:packet, %{...snip...}}, 5000)
    ** (EXIT) no process: the process is not alive or there's no process currently associated with the given name, possibly because its application isn't started

and you installed Elixir and Erlang from the Erlang Solutions repository, you may not have a full installation of erlang. This can be solved with sudo apt-get install esl-erlang. Originally reported in #208.

On fedora if you only install the elixir package you will not have a full erlang installation, this can be fixed by running sudo dnf install erlang (reported in #231)

If you are using Emacs with lsp-mode there's a possibility that you have set the wrong directory as the project root (especially if that directory does not have a mix.exs file). To fix that you should remove the project and re-initialize: