devise gem Ruby on Rails in ubuntu -


i have problem. want install devise gem.my ruby version:2.4.0

in terminal: installing devise 4.2.1 errno::eacces: permission denied @ rb_sysopen - /home/fatih/.rbenv/versions/2.4.0/lib/ruby/gems/2.4.0/gems/devise-4.2.1/.gitignore error occurred while installing devise (4.2.1), , bundler cannot continue. make sure gem install devise -v '4.2.1' succeeds before bundling.


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