Error when configuring lspconfig with mason

Question

I'm trying to set up autocompletion, fixing, etc. for lua files in Neovim. I started by trying to follow the instructions from this video: https://www.youtube.com/watch?v=lpQMeFph1RE&t=188s

However, I quickly found out that sumneko_lua no longer exists so I replaced it with lua_ls. Here is my lazy config:

{'williamboman/mason.nvim', config = function() require("mason").setup() end},
{
    'williamboman/mason-lspconfig.nvim',
    config = function() 
        require("mason-lspconfig").setup({ensure_installed = {'lua_ls'}})
    end,
    dependencies = {'williamboman/mason.nvim'}},
{
    'neovim/nvim-lspconfig',
    dependencies = {'williamboman/mason-lspconfig.nvim', 'williamboman/mason.nvim'},
    config = function() 
        require('lspconfig').lua_ls.setup({})
    end
}

However, when I launch Neovim I see the following error:

Failed to run config for nvim-lspconfig
...share/nvim/lazy/nvim-lspconfig/lua/lspconfig/configs.lua:10: attempt to index local 'config_def' (a boolean value)

I'm confused by this error, since I am not calling anything by the name of config_def. What am I doing wrong here?

Answer 1

For some reason, the name of lua_ls in lspconfig is still sumneko_lua. So replacing this worked:

{'williamboman/mason.nvim', config = function() require("mason").setup() end},
{
    'williamboman/mason-lspconfig.nvim',
    config = function() 
        require("mason-lspconfig").setup({ensure_installed = {'lua_ls'}})
    end,
    dependencies = {'williamboman/mason.nvim'}},
{
    'neovim/nvim-lspconfig',
    dependencies = {'williamboman/mason-lspconfig.nvim', 'williamboman/mason.nvim'},
    config = function() 
        -- HERE'S THE BIT I HAD TO CHANGE:
        require('lspconfig').sumneko_lua.setup({})
    end
}

My guess is that mason has updated the name to lua_ls but lspconfig hasn't.