TagList vim 插件不起作用

我在使用taglist. 例如，如果 I TlistOpen，则显示错误E117: Unknown function: taglist#Tlist_Window_Toggle

我使用的是 Ubuntu18.04 ， vimrc 如下所示；

test@test-VirtualBox:~/.vim/taglist/plugin$ cat ~/.vimrc
set nocompatible              " be iMproved, required
filetype off                  " required

" set the runtime path to include Vundle and initialize
set rtp+=~/.vim/bundle/Vundle.vim
set rtp+=~/.vim/taglist/plugin/
call vundle#begin()
" alternatively, pass a path where Vundle should install plugins
"call vundle#begin('~/some/path/here')

" let Vundle manage Vundle, required
Plugin 'VundleVim/Vundle.vim'

" The following are examples of different formats supported.
" Keep Plugin commands between vundle#begin/end.
" plugin on GitHub repo
Plugin 'tpope/vim-fugitive'
" plugin from http://vim-scripts.org/vim/scripts.html
" Plugin 'L9'
" Git plugin not hosted on GitHub
Plugin 'git://git.wincent.com/command-t.git'
" git repos on your local machine (i.e. when working on your own plugin)
Plugin 'file:///home/gmarik/path/to/plugin'
" The sparkup vim script is in a subdirectory of this repo called vim.
" Pass the path to set the runtimepath properly.
Plugin 'rstacruz/sparkup', {'rtp': 'vim/'}
" Install L9 and avoid a Naming conflict if you've already installed a
" different version somewhere else.
" Plugin 'ascenator/L9', {'name': 'newL9'}

Plugin 'taglist.vim'
" All of your Plugins must be added before the following line
call vundle#end()            " required
filetype plugin indent on    " required
" To ignore plugin indent changes, instead use:
"filetype plugin on
"
" Brief help
" :PluginList       - lists configured plugins
" :PluginInstall    - installs plugins; append `!` to update or just :PluginUpdate
" :PluginSearch foo - searches for foo; append `!` to refresh local cache
" :PluginClean      - confirms removal of unused plugins; append `!` to auto-approve removal
"
" see :h vundle for more details or wiki for FAQ
" Put your non-Plugin stuff after this line
set tags=/home/test/code/tags

我将我的 taglist 克隆到.vim/taglist/plugin. 我Exuberant Ctags的安装在/usr/bin/ctags并且路径在PATH. 我已经安装了 vim 插件管理器vundle。我为目录设置了 cscope 和 ctags code。但是，当我TlistOpen进入时vim，它会引发错误消息E117: Unknown function: taglist#Tlist_Window_Toggle