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You are about to add a blog image upload function. However, https://gyazo.com/b57ed517f5de35ba67399b9bf90f2925
I got a Runtime error.

I think it's probably a gem file problem, but I'm having trouble solving it.
By the way, gem is like this.
source 'https://rubygems.org'
git_source (: github) {| repo | "https://github.com/#{repo}.git"}

ruby ​​'2.5.1'

Bundle edge Rails instead: gem 'rails', github: 'rails/rails'

gem 'rails', '~>5.2.3'

Use sqlite3 as the database for Active Record

gem 'sqlite3'

Use Puma as the app server

gem 'puma', '~>3.11'

Use SCSS for stylesheets gem 'sass-rails', '~>5.0' Use Uglifier as compressor for JavaScript assets

gem 'uglifier', '>= 1.3.0'

See https://github.com/rails/execjs#readme for more supported runtimes gem 'mini_racer', platforms:: ruby ​​ Use CoffeeScript for .coffee assets and views

gem 'coffee-rails', '~>4.2'

Turbolinks makes navigating your web application faster. Read more: https://github.com/turbolinks/turbolinks

gem 'turbolinks', '~>5'

Build JSON APIs with ease. Read more: https://github.com/rails/jbuilder

gem 'jbuilder', '~>2.5'

Use Redis adapter to run Action Cable in production gem 'redis', '~>4.0' Use ActiveModel has_secure_password gem 'bcrypt', '~>3.1.7' Use ActiveStorage variant gem 'mini_magick', '~>4.8' Use Capistrano for deployment gem 'capistrano-rails', group:: development

gem 'bootstrap-sass'
gem 'sass-rails'

gem 'devise'

gem "refile", github: 'refile/refile', require: "refile/rails"
gem "refile-mini_magick", github: 'refile/refile-mini_magick'

Reduces boot times through caching;required in config/boot.rb

gem 'bootsnap', '>= 1.1.0', require: false

group: development,: test do

Call 'byebug' anywhere in the code to stop execution and get a debugger console

gem 'byebug', platforms: [: mri,: mingw,: x64_mingw]
end

group: development do

Access an interactive console on exception pages or by calling 'console' anywhere in the code.

gem 'web-console', '>= 3.3.0'
gem 'listen', '>= 3.0.5', '<3.2'

Spring speeds up development by keeping your application running in the background.Read more: https://github.com/rails/spring

gem 'spring'
gem 'spring-watcher-listen', '~>2.0.0'
end

group: test do

Adds support for Capybara system testing and selenium driver

gem 'capybara', '>= 2.15'
gem 'selenium-webdriver'

Easy installation and use of chromedriver to run system tests with Chrome

gem 'chromedriver-helper'
end

Windows does not include zoneinfo files, so bundle the tzinfo-data gem

gem 'tzinfo-data', platforms: [: mingw,: mswin,: x64_mingw,: jruby]

Kita's https://qiita.com/nekosuke_/items/501e7ba1b286c51c1be9 I was proceeding with this article as a reference, but it was because an error occurred with $brew install ImageMagick of ImageMagick installation.

Thank you for teaching.

  • Answer # 1

      

    I think it's probably a gem file problem, but I'm having trouble solving it.

    Why did you think so? And it seems that the error message has a specific content that says "You should do this", but isn't it executed?

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