How on earth do I open the tree with a keybind

[ElBread3]

Simply adding a key bind and nothing happens when I press F2
what could I be messing up

local function my_on_attach(bufnr)
local api = require "nvim-tree.api"

local function opts(desc)
return { desc = "nvim-tree: " .. desc, buffer = bufnr, noremap = true, silent = true, nowait = true }
end

-- default mappings
api.config.mappings.default_on_attach(bufnr)

vim.keymap.set('n', 'O', '', { buffer = bufnr })
vim.keymap.del('n', 'O', { buffer = bufnr })
vim.keymap.set('n', '<2-RightMouse>', '', { buffer = bufnr })
vim.keymap.del('n', '<2-RightMouse>', { buffer = bufnr })
vim.keymap.set('n', 'D', '', { buffer = bufnr })
vim.keymap.del('n', 'D', { buffer = bufnr })
vim.keymap.set('n', 'E', '', { buffer = bufnr })
vim.keymap.del('n', 'E', { buffer = bufnr })

vim.keymap.set('n', 'A', api.tree.expand_all, opts('Expand All'))
vim.keymap.set('n', '?', api.tree.toggle_help, opts('Help'))
vim.keymap.set('n', 'C', api.tree.change_root_to_node, opts('CD'))

vim.keymap.set('n', '', api.tree.toggle, opts('Toggle Tree'))
end

-- pass to setup along with your other options
require("nvim-tree").setup {

on_attach = my_on_attach,

}