How do I remove Permission denied @ rb_sysopen – Gem install error?

Its a permissions issue. You could fix it with this:

sudo chown -R $(whoami) /Library/Ruby/Gems/*

or possibly in your case

sudo chown -R $(whoami) /Users/stormyramsey/.rbenv/versions/2.3.2/lib/ruby/gems/*

What does this do:

This is telling the system to change the files to change the ownership to the current user. Something must have gotten messed up when something got installed. Usually this is because there are multiple accounts or users are using sudo to install when they should not always have to.

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