Why am i getting 'uninitialized constant Mail::TestMailer' error with "Rails 6.1.5 & Ruby 3.1.0" while working without problems "Rails 6.1.5 & Ruby 3.0.
I'm new to rails and building a simple bank statement converter app. User would select bank name, upload their statement, click "convert", and the converted fil
enter image description here Upgraded rails from 6.0.3 to 6.1.5 but having issues with query methods like eager_load and references. class Note < Application