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Setup MacOS 10.15 Catalina Discussion

Chris Oliver asked in General

When I am installing Rails using command - gem install rails -v 6.0.0, I am getting an permission error.
"You don't have write permissions for the /Library/Ruby/Gems/2.6.0 directory."

Please help with this


@Nitish Kumar
I've had the same problem. Fixed by adding sudo at the beginning.


Has anyone else run into a problem downloading RVM after updating to Catalina?

If I run the install script:

\curl -sSL | bash -s stable

I get:

mkdir: /User_Profile.rvm/src: Read-only file system

I imagine I have to adjust some things for zsh but I am totally stuck!


zsh is now the default in Catalina. I wonder if using bash in your install script is part of the problem?


I get these errors while creating the db. any suggestions?
rake db:create

rake aborted!

TypeError: no implicit conversion of String into Integer
/Users/faqrulislamshaon/rubyrailtest/config/boot.rb:4:in require'
/Users/faqrulislamshaon/rubyrailtest/config/application.rb:1:in require_relative'
/Users/faqrulislamshaon/rubyrailtest/Rakefile:4:in require_relative'
(See full trace by running task with --trace)


I got this error

/Users/uname/.rbenv/versions/2.7.0/lib/ruby/gems/2.7.0/gems/webpacker-4.2.2/lib/webpacker/configuration.rb:95:in rescue in load': Webpacker configuration file not found /Users/uname/Projects/myapp/config/webpacker.yml. Please run rails webpacker:install Error: No such file or directory @ rb_sysopen - /Users/uname/Projects/myapp/config/webpacker.yml (RuntimeError)``

But resolved with the following link:

  1. Install yarn using your OS package manager, or take a look at
  2. Set it up rails webpacker:install
  3. Make sure all packages are up to date yarn install --check-files
  4. Start your Rails server rails s

I just upgraded to Catalina from High Sierra. The final steps:
sudo installer -pkg /Library/Developer/CommandLineTools/Packages/macOS_SDK_headers_for_macOS_10.14.pkg -target /

Returns the error:
installer: Error - the package path specified was invalid: '/Library/Developer/CommandLineTools/Packages/macOS_SDK_headers_for_macOS_10.14.pkg'.

And now I'm unable to build gems:
bundle install:
Fetching sassc 2.2.1
Installing sassc 2.2.1 with native extensions
Gem::Ext::BuildError: ERROR: Failed to build gem native extension.

Any ideas on how to fix?

Thank you!


For all having a problem permissions denied or cannot run a server, make sure you have sudo with command


After following these steps and check the rails -v I get

"Rails is not currently installed on this system. To get the latest version, simply type:
$ sudo gem install rails
You can then rerun your "rails" command."

Please advise,

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