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当我运行命令bundle exec rake db:migrate时,我收到错误:

Could not find mime-types-1.23 in any of the sources

然后我运行:gem list

在输出中有:

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)

可以做什么?

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