Paperclip 2.6.0让佣金中止了！ unitialized常量AddAvatarColumnsToUser错误

I am following the Quickstart on Github for installing Paperclip and getting an error when trying to migrate my database. I have included error from terminal below. I am using Mac OSX. I think this has something to do with Imagemagick but not sure. I have paperclip 2.6.0 and Rails 3.2.0. If someone knows the answer I would be incredibly grateful as I have not found after hours of searching. for ins