问题
When I run the command bundle exec rake db:migrate, I get the error:
Could not find mime-types-1.23 in any of the sources
Then I run: gem list
among the output there is:
mail (2.5.4)
**mime-types (1.23)**
mini_portile (0.5.0)
minitest (4.3.2)
multi_json (1.7.7)
nokogiri (1.6.0)
What can be done?
来源：https://stackoverflow.com/questions/17422925/could-not-find-mime-types-1-23-in-any-of-the-sources