Cocoapods Cause of installation error

Gem can be understood as managing the lookup, installation, upgrade, and uninstallation of Ruby libraries and packages
It's a very useful tool.

An error occurred during the gem install Cocoapods process.
Source set error for 1.gem
Should be referenced, below to execute
Gem Sources--remove https://rubygems.org/
Gem Sources-a https://ruby.taobao.org/

Then execute
Gem Install Cocoapods

The following two are not currently determined to be the cause of the inability to update.

2. During an operation, a certificate was downloaded
Curl-o ~/cacert.pem Http://curl.haxx.se/ca/cacert.pem
VI ~/.bash_profile
Export SSL_CERT_FILE=~/CACERT.PEM
3. Wrong operation, the installation of Ruby Rails

Cocoapods Cause of installation error