While pod installing in a directory, error below shows up:

Could not find 'minitest' (>= 5.1) among 39 total gem(s) (Gem::MissingSpecError)

I have found a solution from Could not find 'cocoapods' (>= 0) among N total gem(s) (Gem::LoadError). But the post says; "delete gems using sudo gem uninstall --all" which doesnt work for me due to having following error.

You don't have write permissions for the /System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/gems/2.6.0 directory.

I had this permission issue before while using "sudo gem install cocoapods" and solved it by installing cocoapods using HomeBrew.

So now what I'm trying to do is deleting gems using brew to not to have that permission issue again.

Tried to do brew uninstall gem, but brew doesnt know what gem is. What can I do to uninstall gems using brew or to uninstall the gems without getting a permission error?

Thanks