Issue using the example config

[FunnyGhost]

Awesome plugin!
Now, I'm trying to use the example config, and I'm getting this error. Any ideas on what am I doing wrong?

Error executing lua callback: ....local/share/nvim/lazy/snacks.nvim/lua/snacks/toggle.lua:116: attempt to call field 'add' (a nil value)
stack traceback:
        ....local/share/nvim/lazy/snacks.nvim/lua/snacks/toggle.lua:116: in function '_wk'
        ....local/share/nvim/lazy/snacks.nvim/lua/snacks/toggle.lua:111: in function 'map'
        /Users/cthulhu/.config/nvim/lua/plugins/snacks.lua:176: in function </Users/cthulhu/.config/nvim/lua/plugins/snacks.lua:162>
        [C]: in function 'nvim_exec_autocmds'
        .../.local/share/nvim/lazy/lazy.nvim/lua/lazy/core/util.lua:152: in function <.../.local/share/nvim/lazy/lazy.nvim/lua/lazy/core/util.lua:147>

[folke]

You're using a pre-historic version of which-key 😅

[FunnyGhost]

You were right! Thank you very much 🙏 , and sorry for the stupid question 😅 .