Describes the cause and action for error messages.
Error Message(English)：
cannot download https //github.com
Cannot download "https://github.com/sass/node- sass/releases ...
https://stackoverflow.com/questions/53257173/cannot-download-https-github-com-sass-node-sass-release・・・
Cannot download https://github.com/sass/node-sass/releases/d ...
https://mdbootstrap.com/support/angular/cannot-download-https-github-com-sass-node-sass-releases-dow・・・