cocoapods pod setup 安装包错

Question

pengqs:.cocoapods hspcadmin$ pod setup
Setting up CocoaPods master repo
[!] Failed to connect to GitHub to update the CocoaPods/Specs specs repo - Please check if you are offline, or that GitHub is down
pengqs:.cocoapods hspcadmin$ gem sources -l
YAML safe loading is not available. Please upgrade psych to a version that supports safe loading (>= 2.0).
CURRENT SOURCES

https://gems.ruby-china.org/