1. Generate project with css engine SASS (express --view=pug --css=sass) 2. Run npm install 3. Get an error Downloading binary from https://github.com/sass/node-sass/releases/download/v3.13.1/darwin-x64-57_binding.node Cannot download "https://github.com/sass/node-sass/releases/download/v3.13.1/darwin-x64-57_binding.node": HTTP error 404 Not Found There is no error if node-sass-middleware=0.11.0