lsp代码补全有问题

[UniStart2]

如题，我的neovim lsp代码补全有问题，它有提示，配置的补全快捷键也有反应，就是当我用回车确认选择的补全代码时候，有时就会报错，没弄的明白这是为啥？主要是 vsnip#anonymous 这个函数没找到，这是还有什么没配好么？

-- plugins.lua 文件中的配置
...

----------------- LSP ----------------------
    -- lspconfig
    use 'neovim/nvim-lspconfig' 
    -- installer: mason 替代 lsp-installer
    use 'williamboman/mason.nvim'
    use 'williamboman/mason-lspconfig.nvim'
    -- 补全引擎
    use 'hrsh7th/nvim-cmp'
    -- snippet 引擎
    use 'L3MON4D3/LuaSnip'
    use 'saadparwaiz1/cmp_luasnip'
    -- 补全源
    use 'hrsh7th/cmp-vsnip'
    use 'hrsh7th/cmp-nvim-lsp' -- 使用lsp内置补全
    use 'hrsh7th/cmp-buffer' -- { name = 'buffer' }
    use 'hrsh7th/cmp-path' -- { name = 'path' }
    use 'hrsh7th/cmp-cmdline' -- { name = 'cmdline' }
    use 'hrsh7th/cmp-nvim-lsp-signature-help'
    -- 常见编程语言代码片段
    use 'rafamadriz/friendly-snippets'
    -- crates.io dependencies补全
    use {
      'saecki/crates.nvim',
      event = { "BufRead Cargo.toml" },
      requires = { { 'nvim-lua/plenary.nvim' } },
      config = function()
          require('crates').setup()
      end,
    }

...

---

--- lsp/cmp.lua 文件
local status_ok, cmp = pcall(require, "cmp")
if not status_ok then
  vim.notify("Not found cmp")
end

cmp.setup({
  -- 指定 snippet 引擎
  snippet = {
    expand = function(args)
      -- For 'vsnip' users
      vim.fn["vsnip#anonymous"](args.body)

      -- For `luasnip` users.
      -- require('luasnip').lsp_expand(args.body)

      -- For `ultisnips` users.
      -- vim.fn["UltiSnips#Anon"](args.body)

      -- For `snippy` users.
      -- require'snippy'.expand_snippet(args.body)
    end,
  },
  -- 补全源配置
  sources = cmp.config.sources({
    -- Neovim内置LSP提供补全内容源
    { name = 'nvim_lsp' },
    -- For vsnip users
    { name = 'vsnip' },

    -- For luasnip users.
    -- { name = 'luasnip' },

    -- For ultisnips users.
    -- { name = 'ultisnips' },

    -- For snippy users.
    -- { name = 'snippy' },
    
    { name = 'buffer' },
    { name = 'path' },
  }),
  -- 快捷键设置
  mapping = require("keybindings").cmp(cmp),
  formatting = require("lsp.ui").formatting
})

-- / 查找模式使用 buffer 源
cmp.setup.cmdline("/", {
  mapping = cmp.mapping.preset.cmdline(),
  source = {
    { name = 'buffer' },
  },
})

-- : 命令行模式中使用 path 和 cmdline 源
cmp.setup.cmdline(":", {
  mapping = cmp.mapping.preset.cmdline(),
  sources = cmp.config.sources({
    { name = "path" },
    { name = "cmdline" },
  }),
})