エラー文

qiita.rb
/home/ubuntu/.rvm/gems/ruby-2.6.3/gems/actionpack-6.0.3/lib/abstract_controller/helpers.rb:152:in `rescue in block in modules_for_helpers': Missing helper file helpers/microposts_helper.rb (AbstractController::Helpers::MissingHelperError)
        from /home/ubuntu/.rvm/gems/ruby-2.6.3/gems/actionpack-6.0.3/lib/abstract_controller/helpers.rb:149:in `block in modules_for_helpers'
        from /home/ubuntu/.rvm/gems/ruby-2.6.3/gems/actionpack-6.0.3/lib/abstract_controller/helpers.rb:145:in `map!'
        from /home/ubuntu/.rvm/gems/ruby-2.6.3/gems/actionpack-6.0.3/lib/abstract_controller/helpers.rb:145:in `modules_for_helpers'
        from /home/ubuntu/.rvm/gems/ruby-2.6.3/gems/actionpack-6.0.3/lib/action_controller/metal/helpers.rb:94:in `modules_for_helpers'
        from /home/ubuntu/.rvm/gems/ruby-2.6.3/gems/actionpack-6.0.3/lib/abstract_controller/helpers.rb:109:in `helper'
        from /home/ubuntu/.rvm/gems/ruby-2.6.3/gems/actionpack-6.0.3/lib/action_controller/railties/helpers.rb:19:in `inherited'
        from /home/ubuntu/environment/sample_app/app/controllers/application_controller.rb:1:in `<main>'
        from /home/ubuntu/.rvm/gems/ruby-2.6.3/gems/bootsnap-1.4.5/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:22:in `require'
        from /home/ubuntu/.rvm/gems/ruby-2.6.3/gems/bootsnap-1.4.5/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:22:in `block in require_with_bootsnap_lfi'
        from /home/ubuntu/.rvm/gems/ruby-2.6.3/gems/bootsnap-1.4.5/lib/bootsnap/load_path_cache/loaded_features_index.rb:92:in `register'
        from /home/ubuntu/.rvm/gems/ruby-2.6.3/gems/bootsnap-1.4.5/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:21:in `require_with_bootsnap_lfi'
        from /home/ubuntu/.rvm/gems/ruby-2.6.3/gems/bootsnap-1.4.5/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:30:in `require'
        from /home/ubuntu/.rvm/gems/ruby-2.6.3/gems/zeitwerk-2.4.0/lib/zeitwerk/kernel.rb:27:in `require'
        from /home/ubuntu/.rvm/gems/ruby-2.6.3/gems/actiontext-6.0.3/lib/action_text/engine.rb:47:in `block (2 levels) in <class:Engine>'
        from /home/ubuntu/.rvm/gems/ruby-2.6.3/gems/activesupport-6.0.3/lib/active_support/callbacks.rb:428:in `instance_exec'
        from /home/ubuntu/.rvm/gems/ruby-2.6.3/gems/activesupport-6.0.3/lib/active_support/callbacks.rb:428:in `block in make_lambda'
        from /home/ubuntu/.rvm/gems/ruby-2.6.3/gems/activesupport-6.0.3/lib/active_support/callbacks.rb:200:in `block (2 levels) in halting'
        from /home/ubuntu/.rvm/gems/ruby-2.6.3/gems/activesupport-6.0.3/lib/active_support/callbacks.rb:605:in `block (2 levels) in default_terminator'
        from /home/ubuntu/.rvm/gems/ruby-2.6.3/gems/activesupport-6.0.3/lib/active_support/callbacks.rb:604:in `catch'
        from /home/ubuntu/.rvm/gems/ruby-2.6.3/gems/activesupport-6.0.3/lib/active_support/callbacks.rb:604:in `block in default_terminator'
        from /home/ubuntu/.rvm/gems/ruby-2.6.3/gems/activesupport-6.0.3/lib/active_support/callbacks.rb:201:in `block in halting'
        from /home/ubuntu/.rvm/gems/ruby-2.6.3/gems/activesupport-6.0.3/lib/active_support/callbacks.rb:513:in `block in invoke_before'
        from /home/ubuntu/.rvm/gems/ruby-2.6.3/gems/activesupport-6.0.3/lib/active_support/callbacks.rb:513:in `each'
        from /home/ubuntu/.rvm/gems/ruby-2.6.3/gems/activesupport-6.0.3/lib/active_support/callbacks.rb:513:in `invoke_before'
        from /home/ubuntu/.rvm/gems/ruby-2.6.3/gems/activesupport-6.0.3/lib/active_support/callbacks.rb:134:in `run_callbacks'
        from /home/ubuntu/.rvm/gems/ruby-2.6.3/gems/activesupport-6.0.3/lib/active_support/execution_wrapper.rb:119:in `complete!'
        from /home/ubuntu/.rvm/gems/ruby-2.6.3/gems/activesupport-6.0.3/lib/active_support/execution_wrapper.rb:90:in `wrap'
        from /home/ubuntu/.rvm/gems/ruby-2.6.3/gems/activesupport-6.0.3/lib/active_support/reloader.rb:51:in `reload!'
        from /home/ubuntu/.rvm/gems/ruby-2.6.3/gems/spring-2.1.0/lib/spring/application.rb:168:in `serve'
        from /home/ubuntu/.rvm/gems/ruby-2.6.3/gems/spring-2.1.0/lib/spring/application.rb:145:in `block in run'
        from /home/ubuntu/.rvm/gems/ruby-2.6.3/gems/spring-2.1.0/lib/spring/application.rb:139:in `loop'
        from /home/ubuntu/.rvm/gems/ruby-2.6.3/gems/spring-2.1.0/lib/spring/application.rb:139:in `run'
        from /home/ubuntu/.rvm/gems/ruby-2.6.3/gems/spring-2.1.0/lib/spring/application/boot.rb:19:in `<top (required)>'
        from /home/ubuntu/.rvm/rubies/ruby-2.6.3/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'
        from /home/ubuntu/.rvm/rubies/ruby-2.6.3/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'
        from -e:1:in `<main>'
対処法

bundle updateして、再度rails sで無事テストできました。