下载的hexo主题必须删掉.git

Question

用hexo s在本地是正常的，但如果部署到网上（我用的是netlify）
·用git clone会提示
“failed during stage 'preparing repo': Error checking out submodules: fatal: No url found for submodule path 'themes/ocean' in .gitmodules”
ocean自然是我选择的主题.
·用git submodule add会提示
“failed during stage 'building site': Deploy directory 'public/' does not exist”