FunctionClauseError Elixir LS Crash

[christhekeele]

Welcome to the forum!

@Lotoen

** (FunctionClauseError) no function clause matching in IO.chardata_to_string/1    
    
    The following arguments were given to IO.chardata_to_string/1:
    
        # 1
        nil
    
    Attempted function clauses (showing 2 out of 2):
    
        def chardata_to_string(+string+) when -is_binary(string)-
        def chardata_to_string(+list+) when -is_list(list)-
    
    (elixir 1.18.4) lib/io.ex:710: IO.chardata_to_string/1
    (elixir 1.18.4) lib/file.ex:177: File.regular?/2
    (mix 1.18.4) lib/mix/tasks/loadconfig.ex:41: Mix.Tasks.Loadconfig.load_default/0

This stacktrace tells me that your mix.exs is setting :config_path to nil, or :config_path is not set. More recent versions of Elixir check for the nil case but 1.18.4 does not. I would check your mix.exs config for issues.