Your bundle is locked to mimemagic (0.3.5), but that version could not be found in any of the sources listed in your Gemfile. If you haven't changed sources, that means the author of mimemagic (0.3.5) has removed it. You'll need to update your bundle to a

Rails Ruby

Railsプロジェクトを動かそうとしたら下記のエラー

Your bundle is locked to mimemagic (0.3.5), but that version could not be found in any of the sources listed in your Gemfile. If you haven't changed sources, that means the author of mimemagic (0.3.5) has removed it. You'll need to update your bundle to a version other than mimemagic (0.3.5) that hasn't been removed in order to install.

mimemagic の指定しているバージョンが yanked になってしまったよう

rubygems.org

対応

bundle update してバージョンアップ

bundle update minemagic