今天我正在制作自定义 vimrc，但它给了我这个错误。它不允许我使用任何插件。有人可以帮助告诉我做错了什么吗？这些行是它显示的错误：
E117: Unknown function: plug#begin
line 10:
E492: Not an editor command: Plug 'rbgrouleff/bclose.vim'
line 11:
E492: Not an editor command: Plug 'dbakker/vim-projectroot'
line 12:
E492: Not an editor command: Plug 'scrooloose/nerdtree'
line 13:
E492: Not an editor command: Plug 'junegunn/fzf'
line 14:
E492: Not an editor command: Plug 'junegunn/fzf.vim'
line 15:
E492: Not an editor command: Plug 'majutsushi/tagbar'
line 18:
E492: Not an editor command: Plug 'vim-airline/vim-airline'
line 19:
E492: Not an editor command: Plug 'vim-airline/vim-airline-themes'
line 20: …