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This suggested edit was approved and applied to the post almost 2 years ago by Monica Cellio‭.

56 / 255 
What does this failure involving mysql on Mac mean?
  • I had to reinstall `mysql` on my Mac, and after some thrashing I was able to again connect to my Qpixel database from the command line. The data is as expected, so it appears that `mysql` itself is ok.
  • When I run the Qpixel server I get this error:
  • ```
  • $ rails s
  • /Users/cellio/.rvm/gems/ruby-3.0.6/gems/mysql2-0.5.4/lib/mysql2.rb:36:in `require': dlopen(/Users/cellio/.rvm/gems/ruby-3.0.6/gems/mysql2-0.5.4/lib/mysql2/mysql2.bundle, 0x0009): Library not loaded: /opt/homebrew/opt/mysql/lib/libmysqlclient.21.dylib (LoadError)
  • ```
  • And the rest of the stack trace in case it's helpful:
  • ```
  • Referenced from: <C48E75F7-C7A1-3D51-A669-683DF84DA6AE> /Users/cellio/.rvm/gems/ruby-3.0.6/gems/mysql2-0.5.4/lib/mysql2/mysql2.bundle
  • Reason: tried: '/opt/homebrew/opt/mysql/lib/libmysqlclient.21.dylib' (no such file), '/System/Volumes/Preboot/Cryptexes/OS/opt/homebrew/opt/mysql/lib/libmysqlclient.21.dylib' (no such file), '/opt/homebrew/opt/mysql/lib/libmysqlclient.21.dylib' (no such file), '/usr/local/lib/libmysqlclient.21.dylib' (no such file), '/usr/lib/libmysqlclient.21.dylib' (no such file, not in dyld cache), '/opt/homebrew/Cellar/mysql/9.0.1/lib/libmysqlclient.21.dylib' (no such file), '/System/Volumes/Preboot/Cryptexes/OS/opt/homebrew/Cellar/mysql/9.0.1/lib/libmysqlclient.21.dylib' (no such file), '/opt/homebrew/Cellar/mysql/9.0.1/lib/libmysqlclient.21.dylib' (no such file), '/usr/local/lib/libmysqlclient.21.dylib' (no such file), '/usr/lib/libmysqlclient.21.dylib' (no such file, not in dyld cache) - /Users/cellio/.rvm/gems/ruby-3.0.6/gems/mysql2-0.5.4/lib/mysql2/mysql2.bundle
  • from /Users/cellio/.rvm/gems/ruby-3.0.6/gems/mysql2-0.5.4/lib/mysql2.rb:36:in `<top (required)>'
  • from /Users/cellio/.rvm/gems/ruby-3.0.6/gems/bundler-2.4.13/lib/bundler/runtime.rb:60:in `require'
  • from /Users/cellio/.rvm/gems/ruby-3.0.6/gems/bundler-2.4.13/lib/bundler/runtime.rb:60:in `block (2 levels) in require'
  • from /Users/cellio/.rvm/gems/ruby-3.0.6/gems/bundler-2.4.13/lib/bundler/runtime.rb:55:in `each'
  • from /Users/cellio/.rvm/gems/ruby-3.0.6/gems/bundler-2.4.13/lib/bundler/runtime.rb:55:in `block in require'
  • from /Users/cellio/.rvm/gems/ruby-3.0.6/gems/bundler-2.4.13/lib/bundler/runtime.rb:44:in `each'
  • from /Users/cellio/.rvm/gems/ruby-3.0.6/gems/bundler-2.4.13/lib/bundler/runtime.rb:44:in `require'
  • from /Users/cellio/.rvm/gems/ruby-3.0.6/gems/bundler-2.4.13/lib/bundler.rb:187:in `require'
  • from /Users/cellio/Data/codidact/qpixel/config/application.rb:7:in `<top (required)>'
  • from /Users/cellio/.rvm/gems/ruby-3.0.6/gems/railties-7.0.8.4/lib/rails/commands/server/server_command.rb:137:in `require'
  • from /Users/cellio/.rvm/gems/ruby-3.0.6/gems/railties-7.0.8.4/lib/rails/commands/server/server_command.rb:137:in `block in perform'
  • from <internal:kernel>:90:in `tap'
  • from /Users/cellio/.rvm/gems/ruby-3.0.6/gems/railties-7.0.8.4/lib/rails/commands/server/server_command.rb:134:in `perform'
  • from /Users/cellio/.rvm/gems/ruby-3.0.6/gems/thor-1.3.1/lib/thor/command.rb:28:in `run'
  • from /Users/cellio/.rvm/gems/ruby-3.0.6/gems/thor-1.3.1/lib/thor/invocation.rb:127:in `invoke_command'
  • from /Users/cellio/.rvm/gems/ruby-3.0.6/gems/thor-1.3.1/lib/thor.rb:527:in `dispatch'
  • from /Users/cellio/.rvm/gems/ruby-3.0.6/gems/railties-7.0.8.4/lib/rails/command/base.rb:87:in `perform'
  • from /Users/cellio/.rvm/gems/ruby-3.0.6/gems/railties-7.0.8.4/lib/rails/command.rb:48:in `invoke'
  • from /Users/cellio/.rvm/gems/ruby-3.0.6/gems/railties-7.0.8.4/lib/rails/commands.rb:18:in `<top (required)>'
  • from /Users/cellio/Data/codidact/qpixel/bin/rails:9:in `require'
  • from /Users/cellio/Data/codidact/qpixel/bin/rails:9:in `<top (required)>'
  • from /Users/cellio/.rvm/gems/ruby-3.0.6/gems/spring-4.0.0/lib/spring/client/rails.rb:30:in `load'
  • from /Users/cellio/.rvm/gems/ruby-3.0.6/gems/spring-4.0.0/lib/spring/client/rails.rb:30:in `call'
  • from /Users/cellio/.rvm/gems/ruby-3.0.6/gems/spring-4.0.0/lib/spring/client/command.rb:7:in `call'
  • from /Users/cellio/.rvm/gems/ruby-3.0.6/gems/spring-4.0.0/lib/spring/client.rb:30:in `run'
  • from /Users/cellio/.rvm/gems/ruby-3.0.6/gems/spring-4.0.0/bin/spring:49:in `<top (required)>'
  • from /Users/cellio/.rvm/gems/ruby-3.0.6/gems/spring-4.0.0/lib/spring/binstub.rb:11:in `load'
  • from /Users/cellio/.rvm/gems/ruby-3.0.6/gems/spring-4.0.0/lib/spring/binstub.rb:11:in `<top (required)>'
  • from /Users/cellio/Data/codidact/qpixel/bin/spring:12:in `require'
  • from /Users/cellio/Data/codidact/qpixel/bin/spring:12:in `block in <top (required)>'
  • from <internal:kernel>:90:in `tap'
  • from /Users/cellio/Data/codidact/qpixel/bin/spring:9:in `<top (required)>'
  • from bin/rails:3:in `load'
  • from bin/rails:3:in `<main>'
  • ```
  • I tried reverting `Gemfile` to the version before a recent Dependobot update, just in case, and that didn't make a difference. Rails seems to be complaining about a gem named `mysql2-0.5.4`, which has been in Gemfile for more than a year.
  • I haven't changed Ruby version since the last code change that required it (a long time ago). `rvm` does not seem to know about a newer version (for the Mac) than 3.0.6, what I'm using.
  • I'm stumped. How do I diagnose this and fix or work around it? This is for my development environment, not a production system. I've had to locally edit Gemfile before, so local overrides are ok if needed. But I don't know where I need to poke at what.
  • I had to reinstall `mysql` on my Mac, and after some thrashing I was able to again connect to my Qpixel database from the command line. The data is as expected, so it appears that `mysql` itself is ok.
  • When I run the Qpixel server I get this error:
  • ```text
  • $ rails s
  • /Users/cellio/.rvm/gems/ruby-3.0.6/gems/mysql2-0.5.4/lib/mysql2.rb:36:in `require': dlopen(/Users/cellio/.rvm/gems/ruby-3.0.6/gems/mysql2-0.5.4/lib/mysql2/mysql2.bundle, 0x0009): Library not loaded: /opt/homebrew/opt/mysql/lib/libmysqlclient.21.dylib (LoadError)
  • ```
  • And the rest of the stack trace in case it's helpful:
  • ```text
  • Referenced from: <C48E75F7-C7A1-3D51-A669-683DF84DA6AE> /Users/cellio/.rvm/gems/ruby-3.0.6/gems/mysql2-0.5.4/lib/mysql2/mysql2.bundle
  • Reason: tried: '/opt/homebrew/opt/mysql/lib/libmysqlclient.21.dylib' (no such file), '/System/Volumes/Preboot/Cryptexes/OS/opt/homebrew/opt/mysql/lib/libmysqlclient.21.dylib' (no such file), '/opt/homebrew/opt/mysql/lib/libmysqlclient.21.dylib' (no such file), '/usr/local/lib/libmysqlclient.21.dylib' (no such file), '/usr/lib/libmysqlclient.21.dylib' (no such file, not in dyld cache), '/opt/homebrew/Cellar/mysql/9.0.1/lib/libmysqlclient.21.dylib' (no such file), '/System/Volumes/Preboot/Cryptexes/OS/opt/homebrew/Cellar/mysql/9.0.1/lib/libmysqlclient.21.dylib' (no such file), '/opt/homebrew/Cellar/mysql/9.0.1/lib/libmysqlclient.21.dylib' (no such file), '/usr/local/lib/libmysqlclient.21.dylib' (no such file), '/usr/lib/libmysqlclient.21.dylib' (no such file, not in dyld cache) - /Users/cellio/.rvm/gems/ruby-3.0.6/gems/mysql2-0.5.4/lib/mysql2/mysql2.bundle
  • from /Users/cellio/.rvm/gems/ruby-3.0.6/gems/mysql2-0.5.4/lib/mysql2.rb:36:in `<top (required)>'
  • from /Users/cellio/.rvm/gems/ruby-3.0.6/gems/bundler-2.4.13/lib/bundler/runtime.rb:60:in `require'
  • from /Users/cellio/.rvm/gems/ruby-3.0.6/gems/bundler-2.4.13/lib/bundler/runtime.rb:60:in `block (2 levels) in require'
  • from /Users/cellio/.rvm/gems/ruby-3.0.6/gems/bundler-2.4.13/lib/bundler/runtime.rb:55:in `each'
  • from /Users/cellio/.rvm/gems/ruby-3.0.6/gems/bundler-2.4.13/lib/bundler/runtime.rb:55:in `block in require'
  • from /Users/cellio/.rvm/gems/ruby-3.0.6/gems/bundler-2.4.13/lib/bundler/runtime.rb:44:in `each'
  • from /Users/cellio/.rvm/gems/ruby-3.0.6/gems/bundler-2.4.13/lib/bundler/runtime.rb:44:in `require'
  • from /Users/cellio/.rvm/gems/ruby-3.0.6/gems/bundler-2.4.13/lib/bundler.rb:187:in `require'
  • from /Users/cellio/Data/codidact/qpixel/config/application.rb:7:in `<top (required)>'
  • from /Users/cellio/.rvm/gems/ruby-3.0.6/gems/railties-7.0.8.4/lib/rails/commands/server/server_command.rb:137:in `require'
  • from /Users/cellio/.rvm/gems/ruby-3.0.6/gems/railties-7.0.8.4/lib/rails/commands/server/server_command.rb:137:in `block in perform'
  • from <internal:kernel>:90:in `tap'
  • from /Users/cellio/.rvm/gems/ruby-3.0.6/gems/railties-7.0.8.4/lib/rails/commands/server/server_command.rb:134:in `perform'
  • from /Users/cellio/.rvm/gems/ruby-3.0.6/gems/thor-1.3.1/lib/thor/command.rb:28:in `run'
  • from /Users/cellio/.rvm/gems/ruby-3.0.6/gems/thor-1.3.1/lib/thor/invocation.rb:127:in `invoke_command'
  • from /Users/cellio/.rvm/gems/ruby-3.0.6/gems/thor-1.3.1/lib/thor.rb:527:in `dispatch'
  • from /Users/cellio/.rvm/gems/ruby-3.0.6/gems/railties-7.0.8.4/lib/rails/command/base.rb:87:in `perform'
  • from /Users/cellio/.rvm/gems/ruby-3.0.6/gems/railties-7.0.8.4/lib/rails/command.rb:48:in `invoke'
  • from /Users/cellio/.rvm/gems/ruby-3.0.6/gems/railties-7.0.8.4/lib/rails/commands.rb:18:in `<top (required)>'
  • from /Users/cellio/Data/codidact/qpixel/bin/rails:9:in `require'
  • from /Users/cellio/Data/codidact/qpixel/bin/rails:9:in `<top (required)>'
  • from /Users/cellio/.rvm/gems/ruby-3.0.6/gems/spring-4.0.0/lib/spring/client/rails.rb:30:in `load'
  • from /Users/cellio/.rvm/gems/ruby-3.0.6/gems/spring-4.0.0/lib/spring/client/rails.rb:30:in `call'
  • from /Users/cellio/.rvm/gems/ruby-3.0.6/gems/spring-4.0.0/lib/spring/client/command.rb:7:in `call'
  • from /Users/cellio/.rvm/gems/ruby-3.0.6/gems/spring-4.0.0/lib/spring/client.rb:30:in `run'
  • from /Users/cellio/.rvm/gems/ruby-3.0.6/gems/spring-4.0.0/bin/spring:49:in `<top (required)>'
  • from /Users/cellio/.rvm/gems/ruby-3.0.6/gems/spring-4.0.0/lib/spring/binstub.rb:11:in `load'
  • from /Users/cellio/.rvm/gems/ruby-3.0.6/gems/spring-4.0.0/lib/spring/binstub.rb:11:in `<top (required)>'
  • from /Users/cellio/Data/codidact/qpixel/bin/spring:12:in `require'
  • from /Users/cellio/Data/codidact/qpixel/bin/spring:12:in `block in <top (required)>'
  • from <internal:kernel>:90:in `tap'
  • from /Users/cellio/Data/codidact/qpixel/bin/spring:9:in `<top (required)>'
  • from bin/rails:3:in `load'
  • from bin/rails:3:in `<main>'
  • ```
  • I tried reverting `Gemfile` to the version before a recent Dependabot update, just in case, and that didn't make a difference. Rails seems to be complaining about a gem named `mysql2-0.5.4`, which has been in Gemfile for more than a year.
  • I haven't changed Ruby version since the last code change that required it (a long time ago). `rvm` does not seem to know about a newer version (for the Mac) than 3.0.6, what I'm using.
  • I'm stumped. How do I diagnose this and fix or work around it? This is for my development environment, not a production system. I've had to locally edit Gemfile before, so local overrides are ok if needed. But I don't know where I need to poke at what.
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Suggested almost 2 years ago by trichoplax‭