如下述錯誤訊息，在執行’rails c’後發生。我猜想是在更新homebrew等package management後導致。
/Users/hothero/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/irb/completion.rb:9:in `require’: dlopen(/Users/hothero/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/x86_64-darwin11.1.0/readline.bundle, 9): Library not loaded: /Users/hothero/.rvm/usr/lib/libreadline.6.2.dylib (LoadError)
Referenced from: /Users/hothero/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/x86_64-darwin11.1.0/readline.bundle
Reason: image not found – /Users/hothero/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/x86_64-darwin11.1.0/readline.bundle
from /Users/hothero/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/irb/completion.rb:9:in `<top (required)>’
from /Users/hothero/rails_projects/webCourseSite/readline/ruby/1.9.1/gems/railties-3.2.1/lib/rails/commands/console.rb:3:in `require’
from /Users/hothero/rails_projects/webCourseSite/readline/ruby/1.9.1/gems/railties-3.2.1/lib/rails/commands/console.rb:3:in `<top (required)>’
from /Users/hothero/rails_projects/webCourseSite/readline/ruby/1.9.1/gems/railties-3.2.1/lib/rails/commands.rb:38:in `require’
from /Users/hothero/rails_projects/webCourseSite/readline/ruby/1.9.1/gems/railties-3.2.1/lib/rails/commands.rb:38:in `<top (required)>’
from script/rails:6:in `require’
from script/rails:6:in `<main>‘
如紅色所示，是我認為發生問題的關鍵點。我嘗試用’brew link readline’來重設，但出現"Error: readline has multiple installed versions"。故：
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