rails 服务器未启动 - nil：NilClass (NoMethodError) 错误的未定义方法"格式化程序"

Question

我使用的是rails 4.1，但是当我尝试在终端上运行'rails s'时，它给出了这个错误:

Exiting
/home/ben/.rvm/gems/ruby-2.0.0-p247@addtocartalerts/gems/railties-4.0.4/lib/rails/commands/server.rb:78:in `start': undefined method `formatter' for nil:NilClass (NoMethodError)
        from /home/ben/.rvm/gems/ruby-2.0.0-p247@addtocartalerts/gems/railties-4.0.4/lib/rails/commands.rb:76:in `block in <top (required)>'
        from /home/ben/.rvm/gems/ruby-2.0.0-p247@addtocartalerts/gems/railties-4.0.4/lib/rails/commands.rb:71:in `tap'
        from /home/ben/.rvm/gems/ruby-2.0.0-p247@addtocartalerts/gems/railties-4.0.4/lib/rails/commands.rb:71:in `<top (required)>'
        from bin/rails:4:in `require'
        from bin/rails:4:in `<main>'

请帮

Answer 1

您没有使用rails 4.1。看看铁路的宝石小径。上面写着railties 4.0.4

检查Gemfile版本是否正确。执行bundle update rails。如果您安装了多个rails gem，则使用binstub或bundle exec rails s