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UnityでCocoaPodsがインストールできないエラー

解決したいこと

超初心者です。
UnityでiOSアプリを作っています。
他人からもらったプロジェクトを開くと以下のエラーが表示されています。
解決方法を教えて下さい。

発生している問題・エラー

iOS Resolver

Failed to install CocoaPods for the current user.
It will not be possible to install Cocoapods in the generated Xcode project which will result in link errors when building your application.
For more information see:
https://guides.cocoapods.org/using/getting-started.html
'gem install cocoapods --user-install' failed with code (1):
WARNING: You don't have
/Users/ユーザー名/.gem/ruby/2.6.0/bin in your PATH,
gem executables will not run.
ERROR: Error installing cocoapods:
The last version of drb (>= 0) to support your Ruby & RubyGems was 2.0.6. Try installing it with 'gem install drb -v 2.0.6 and then running the current command again
drb requires Ruby version >= 2.7.0. The current ruby
version is 2.6.10.210.

自分で試したこと

ChatGPTを頼りにターミナルで以下は試しましたが、
Unityを再起動してもエラーは変わらずです。

ユーザー名@ユーザー名noMacBook-Pro ~ % ruby -v
ruby 3.3.0 (2023-12-25 revision 5124f9ac75) [arm64-darwin23]
ユーザー名@ユーザー名noMacBook-Pro ~ % echo $PATH
/opt/homebrew/lib/ruby/gems/3.3.0/bin:/Users/ユーザー名/.gem/ruby/3.3.0/bin:/opt/homebrew/opt/ruby/bin:/opt/homebrew/bin:/opt/homebrew/sbin:/usr/local/bin:/System/Cryptexes/App/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin:/var/run/com.apple.security.cryptexd/codex.system/bootstrap/usr/local/bin:/var/run/com.apple.security.cryptexd/codex.system/bootstrap/usr/bin:/var/run/com.apple.security.cryptexd/codex.system/bootstrap/usr/appleinternal/bin:/Library/Apple/usr/bin:/Library/Frameworks/Mono.framework/Versions/Current/Commands
ユーザー名@ユーザー名noMacBook-Pro ~ % sudo gem install cocoapods
Password:
Successfully installed cocoapods-1.15.2
Parsing documentation for cocoapods-1.15.2
Done installing documentation for cocoapods after 0 seconds
1 gem installed
ユーザー名@ユーザー名noMacBook-Pro ~ % pod --version
1.15.2
ユーザー名@ユーザー名noMacBook-Pro ~ %
0

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