Unable to install cocoapods on Catalina - xcode

Question

I have catalina OS 10.15.7 and XCode Version 12.4 (12D4e)
I am trying to install cocoapods using gem:
sudo gem install cocoapods
And I am getting this error:
ERROR: While executing gem ... (Gem::FilePermissionError)
You don't have write permissions for the /System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/gems/2.6.0 directory.
It has been a nightmare to resolve this.
I tried using brew install. Brew is able to install it. But the pod does not work. when I use simple commands like
pod init
or
pod -v
I am getting this error:
Traceback (most recent call last):
16: from /usr/local/Cellar/cocoapods/1.11.2_1/libexec/bin/pod:23:in `<main>'
15: from /Library/Ruby/Site/2.6.0/rubygems.rb:285:in `activate_bin_path'
14: from /Library/Ruby/Site/2.6.0/rubygems.rb:285:in `synchronize'
13: from /Library/Ruby/Site/2.6.0/rubygems.rb:286:in `block in activate_bin_path'
12: from /Library/Ruby/Site/2.6.0/rubygems/specification.rb:1369:in `activate'
11: from /Library/Ruby/Site/2.6.0/rubygems/specification.rb:1387:in `activate_dependencies'
10: from /Library/Ruby/Site/2.6.0/rubygems/specification.rb:1387:in `each'
9: from /Library/Ruby/Site/2.6.0/rubygems/specification.rb:1405:in `block in activate_dependencies'
8: from /Library/Ruby/Site/2.6.0/rubygems/specification.rb:1369:in `activate'
7: from /Library/Ruby/Site/2.6.0/rubygems/specification.rb:1387:in `activate_dependencies'
6: from /Library/Ruby/Site/2.6.0/rubygems/specification.rb:1387:in `each'
5: from /Library/Ruby/Site/2.6.0/rubygems/specification.rb:1405:in `block in activate_dependencies'
4: from /Library/Ruby/Site/2.6.0/rubygems/specification.rb:1369:in `activate'
3: from /Library/Ruby/Site/2.6.0/rubygems/specification.rb:1387:in `activate_dependencies'
2: from /Library/Ruby/Site/2.6.0/rubygems/specification.rb:1387:in `each'
1: from /Library/Ruby/Site/2.6.0/rubygems/specification.rb:1399:in `block in activate_dependencies'
/Library/Ruby/Site/2.6.0/rubygems/dependency.rb:311:in `to_specs': Could not find 'minitest' (>= 5.1) among 39 total gem(s) (Gem::MissingSpecError)
Checked in 'GEM_PATH=/Users/pankajnafria/.local/share/gem/ruby/2.6.0:/System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/gems/2.6.0:/usr/local/Cellar/cocoapods/1.11.2_1/libexec' , execute `gem env` for more information
16: from /usr/local/Cellar/cocoapods/1.11.2_1/libexec/bin/pod:23:in `<main>'
15: from /Library/Ruby/Site/2.6.0/rubygems.rb:285:in `activate_bin_path'
14: from /Library/Ruby/Site/2.6.0/rubygems.rb:285:in `synchronize'
13: from /Library/Ruby/Site/2.6.0/rubygems.rb:286:in `block in activate_bin_path'
12: from /Library/Ruby/Site/2.6.0/rubygems/specification.rb:1369:in `activate'
11: from /Library/Ruby/Site/2.6.0/rubygems/specification.rb:1387:in `activate_dependencies'
10: from /Library/Ruby/Site/2.6.0/rubygems/specification.rb:1387:in `each'
9: from /Library/Ruby/Site/2.6.0/rubygems/specification.rb:1405:in `block in activate_dependencies'
8: from /Library/Ruby/Site/2.6.0/rubygems/specification.rb:1369:in `activate'
7: from /Library/Ruby/Site/2.6.0/rubygems/specification.rb:1387:in `activate_dependencies'
6: from /Library/Ruby/Site/2.6.0/rubygems/specification.rb:1387:in `each'
5: from /Library/Ruby/Site/2.6.0/rubygems/specification.rb:1405:in `block in activate_dependencies'
4: from /Library/Ruby/Site/2.6.0/rubygems/specification.rb:1369:in `activate'
3: from /Library/Ruby/Site/2.6.0/rubygems/specification.rb:1387:in `activate_dependencies'
2: from /Library/Ruby/Site/2.6.0/rubygems/specification.rb:1387:in `each'
1: from /Library/Ruby/Site/2.6.0/rubygems/specification.rb:1398:in `block in activate_dependencies'
/Library/Ruby/Site/2.6.0/rubygems/specification.rb:1401:in `rescue in block in activate_dependencies': Could not find 'minitest' (>= 5.1) among 39 total gem(s) (Gem::MissingSpecError)
Checked in 'GEM_PATH=/Users/pankajnafria/.local/share/gem/ruby/2.6.0:/System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/gems/2.6.0:/usr/local/Cellar/cocoapods/1.11.2_1/libexec' at: /usr/local/Cellar/cocoapods/1.11.2_1/libexec/specifications/activesupport-6.1.4.1.gemspec, execute `gem env` for more information
Appreciate any help in resolving this issue.

Answer 1

Open Terminal
curl -L https://get.rvm.io | bash -s stable
Then, close and reopen terminal
rvm install ruby-3.1.1
When finished, run:
rvm use ruby-3.1.1
And then:
rvm --default use 3.1.1
Next step, install cocoapods using:
sudo gem install cocoapods
For more info, check this [link].(https://developer.apple.com/forums/thread/697249)

Answer 2

I was able to resolve this issue by reinstalling Ruby/Rubygems and CocoaPods.
First, I followed Moncef Belyamani's thorough instructions for installing Ruby/Rubygems.
Next, I ran several commands:
gem install json
gem install CFPropertyList
gem pristine json --version 2.6.1
Per suggestion from here:
gem update --system 3.2.33
And I reinstalled CocoaPods:
brew uninstall cocoapods
brew cleanup -s
brew install cocoapods