Could not find a valid gem 'sass' (= 3.2.19), here is why:

错误如下

Could not find a valid gem 'sass' (= 3.2.19), here is why:    Unable to download data from https://rubygems.org/ - Received fatal alert: protocol_version (https://api.rubygems.org/specs.4.8.gz)

我的解决方法：

gem sources --add http://gems.ruby-china.com/ --remove [https://rubygems.org/](https://rubygems.org/