提示错误ValueError: Still no compile flags, no completions yet
在vimrc里面配置下Extra conf试试。
如果你用vundle,那就是:let g:ycm_global_ycm_extra_conf = '~/.vim/bundle/YouCompleteMe/third_party/ycmd/cpp/ycm/.ycm_extra_conf.py'
如果你用Vim-Plug,那就是:let g:ycm_global_ycm_extra_conf = '~/.vim/plugged/YouCompleteMe/third_party/ycmd/cpp/ycm/.ycm_extra_conf.py'
你是在什么编辑器上安装vim插件?