rvm 2.1.4跑起來正常的專案，升級rvm 2.2.2就噴下面錯誤訊息要怎麼修正它呢？ https://github.com/shawnkaku/postit-solution.git 補充：下載後要先bundle update json sqlite3 感謝網友 蔡鴻銘 指導 https://github.com/....../active_scaffold/issues/380...... 升級到rails 4.1.16 + ruby 2.2.4 問題就消失了 Step 1:安裝rvm 2.2.4 $ rvm install 2.2.4 $ rvm use 2.2.4 Using /Users/shawnkuo/.rvm/gems/ruby-2.2.4 Step 2: 修改Gemfile source 'https://rubygems.org' ruby '2.2.4' gem 'rails', '4.1.16' Step 3:升級專案套件 $ ruby -v ruby 2.2.4p230 (2015-12-16 revision 53155) [x86_64-darwin17] $ bundle install Fetching gem metadata from https://rubygems.org/.......... Fetching gem metadata from https://rubygems.org/. Resolving dependencies... Bundler could not find compatible versions for gem "activesupport": In snapshot (Gemfile.lock): activesupport (= 4.0.0) In Gemfile: sass-rails (~> 4.0.0) was resolved to 4.0.0, which depends on sprockets-rails (~> 2.0.0) was resolved t...