bundler: failed to load command: puma - ruby

Question

Im trying to run the heroku local command in CML heroku local. heroku local command allows you to boot the project locally in the same way that it will be once it's pushed to Heroku to troubleshoot problems in a local development environment. Ive tried deleting my Gemfile.lock and running bundle install again did not work. I also tried using command bundle exec heroku local and I'm still getting the same error message.
I installed ruby using home-brew through the CML. Output of ruby-v: ruby 2.7.6p219 (2022-04-12 revision c9c2245c0a) [arm64-darwin21]. Output of file $(which ruby): Users/chris/.rubies/ruby-2.7.6/bin/ruby: Mach-O 64-bit executable arm64.
My GemFile:
source "https://rubygems.org"
ruby "2.7.6"
gem "sinatra", "~>1.4.7"
gem "sinatra-contrib"
gem "erubis"
group :production do
gem "puma"
end
My Gemfile.lock:
GEM
remote: https://rubygems.org/
specs:
backports (3.23.0)
erubis (2.7.0)
multi_json (1.15.0)
nio4r (2.5.8)
puma (6.0.0)
nio4r (~> 2.0)
rack (1.6.13)
rack-protection (1.5.5)
rack
rack-test (2.0.2)
rack (>= 1.3)
sinatra (1.4.8)
rack (~> 1.5)
rack-protection (~> 1.4)
tilt (>= 1.3, < 3)
sinatra-contrib (1.4.7)
backports (>= 2.0)
multi_json
rack-protection
rack-test
sinatra (~> 1.4.0)
tilt (>= 1.3, < 3)
tilt (2.0.11)
PLATFORMS
arm64-darwin-21
DEPENDENCIES
erubis
puma
sinatra (~> 1.4.7)
sinatra-contrib
RUBY VERSION
ruby 2.7.6p219
BUNDLED WITH
2.3.26
Expected return value:
$ heroku local
forego | starting web.1 on port 5000
web.1 | Puma starting in single mode...
web.1 | * Listening on tcp://0.0.0.0:5000
web.1 | Use Ctrl-C to stop
Actual return value:
bundler: failed to load command: puma (/Users/chris/.gem/ruby/2.7.6/bin/puma)
4:29:41 PM web.1 | /Users/chris/.gem/ruby/2.7.6/gems/puma-6.0.0/lib/puma.rb:14:in `require': dlopen(/Users/chris/.gem/ruby/2.7.6/gems/puma-6.0.0/lib/puma/puma_http11.bundle, 0x0009): tried: '/Users/chris/.gem/ruby/2.7.6/gems/puma-6.0.0/lib/puma/puma_http11.bundle' (mach-o file, but is an incompatible architecture (have 'x86_64', need 'arm64')), '/System/Volumes/Preboot/Cryptexes/OS/Users/chris/.gem/ruby/2.7.6/gems/puma-6.0.0/lib/puma/puma_http11.bundle' (no such file), '/Users/chris/.gem/ruby/2.7.6/gems/puma-6.0.0
4:29:41 PM web.1 | > /lib/puma/puma_http11.bundle' (mach-o file, but is an incompatible architecture (have 'x86_64', need 'arm64')) - /Users/chris/.gem/ruby/2.7.6/gems/puma-6.0.0/lib/puma/puma_http11.bundle (LoadError)
4:29:41 PM web.1 | from /Users/chris/.gem/ruby/2.7.6/gems/puma-6.0.0/lib/puma.rb:14:in `<top (required)>'
4:29:41 PM web.1 | from /Users/chris/.gem/ruby/2.7.6/gems/puma-6.0.0/lib/puma/cli.rb:6:in `require_relative'
4:29:41 PM web.1 | from /Users/chris/.gem/ruby/2.7.6/gems/puma-6.0.0/lib/puma/cli.rb:6:in `<top (required)>'
4:29:41 PM web.1 | from /Users/chris/.gem/ruby/2.7.6/gems/puma-6.0.0/bin/puma:6:in `require'
4:29:41 PM web.1 | from /Users/chris/.gem/ruby/2.7.6/gems/puma-6.0.0/bin/puma:6:in `<top (required)>'
4:29:41 PM web.1 | from /Users/chris/.gem/ruby/2.7.6/bin/puma:25:in `load'
4:29:41 PM web.1 | from /Users/chris/.gem/ruby/2.7.6/bin/puma:25:in `<top (required)>'
4:29:41 PM web.1 | from /Users/chris/.gem/ruby/2.7.6/gems/bundler-2.3.26/lib/bundler/cli/exec.rb:58:in `load'
4:29:41 PM web.1 | from /Users/chris/.gem/ruby/2.7.6/gems/bundler-2.3.26/lib/bundler/cli/exec.rb:58:in `kernel_load'
4:29:41 PM web.1 | from /Users/chris/.gem/ruby/2.7.6/gems/bundler-2.3.26/lib/bundler/cli/exec.rb:23:in `run'
4:29:41 PM web.1 | from /Users/chris/.gem/ruby/2.7.6/gems/bundler-2.3.26/lib/bundler/cli.rb:486:in `exec'
4:29:41 PM web.1 | from /Users/chris/.gem/ruby/2.7.6/gems/bundler-2.3.26/lib/bundler/vendor/thor/lib/thor/command.rb:27:in `run'
4:29:41 PM web.1 | from /Users/chris/.gem/ruby/2.7.6/gems/bundler-2.3.26/lib/bundler/vendor/thor/lib/thor/invocation.rb:127:in `invoke_command'
4:29:41 PM web.1 | from /Users/chris/.gem/ruby/2.7.6/gems/bundler-2.3.26/lib/bundler/vendor/thor/lib/thor.rb:392:in `dispatch'
4:29:41 PM web.1 | from /Users/chris/.gem/ruby/2.7.6/gems/bundler-2.3.26/lib/bundler/cli.rb:31:in `dispatch'
4:29:41 PM web.1 | from /Users/chris/.gem/ruby/2.7.6/gems/bundler-2.3.26/lib/bundler/vendor/thor/lib/thor/base.rb:485:in `start'
4:29:41 PM web.1 | from /Users/chris/.gem/ruby/2.7.6/gems/bundler-2.3.26/lib/bundler/cli.rb:25:in `start'
4:29:41 PM web.1 | from /Users/chris/.gem/ruby/2.7.6/gems/bundler-2.3.26/exe/bundle:48:in `block in <top (required)>'
4:29:41 PM web.1 | from /Users/chris/.gem/ruby/2.7.6/gems/bundler-2.3.26/lib/bundler/friendly_errors.rb:120:in `with_friendly_errors'
4:29:41 PM web.1 | from /Users/chris/.gem/ruby/2.7.6/gems/bundler-2.3.26/exe/bundle:36:in `<top (required)>'
4:29:41 PM web.1 | from /Users/chris/.gem/ruby/2.7.6/bin/bundle:25:in `load'
4:29:41 PM web.1 | from /Users/chris/.gem/ruby/2.7.6/bin/bundle:25:in `<main>'
[DONE] Killing all processes with signal SIGINT
4:29:41 PM web.1 Exited with exit code null
Ive tried deleting my Gemfile.lock and running bundle install again did not work. I also tried using command bundle exec heroku local and I'm still getting the same error message.

Answer 1

When running your application locally on Apple Silicon and on production on Heroku then that means you are running your application on different platforms. And you have to make Bundler aware that it needs to be able to handle the required gems for all platforms.
While Bundler's generic ruby platform works in most cases, there are edge cases in which working with the platform-specific versions is required or preferred. For example, installing the libv8-node gem is extremely slow in Apple Silicon when not using the correct platform. Another example seems to be the puma gem you are using that explicitly requires the correct platform configuration to work.
Therefore, I suggest adding all platforms that you are currently using to the Gemfile. That ensures that you do not add gems that are not available for all platforms. And the ability to use platform-optimized versions should improve especially the compiling time of gems with C bindings.
I suggest adding all platforms you are using (according to the error message) to your Gemfile like this:
bundle lock --add-platform ruby x86_64 arm64
Then run bundle install again.
See the Bundler documentation about bundle platform and bundle lock.

Answer 2

I figured it out! So the problem was I was using x86_64 architecture but I needed to use arm64 architecture. I verified which architecture by using command uname -m. To switch to arm64 I used command env /usr/bin/arch -arm64 /bin/zsh --login.