Bug rack/server.rb:362:in initialize: Permission denied @ rb_sysopen (Errno::EACCES)

phiên bản sử dụng là rvm

Try first update gem owner

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sudo chown -R userowner:yourgroup ~/.rvm

Update permission

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rvmsudo rvm get stable --auto-dotfiles
rvm fix-permissions system

update user in group rvm

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rvm group add rvm $USER

Ìf not work try update Gem

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gem update 
gem cleanup