我一直在跟踪在Rails上的疯狂安装并在上面创建了扩展名，但是当我运行rails db：migrate时出现此错误
rails aborted!
Gem::ConflictError: Unable to activate money-6.12.0, because i18n-1.1.0 conflicts with i18n (< 1.1, >= 0.6.4)
/home/omis/spree_simple_sales/Rakefile:5:in `<top (required)>'
bin/rails:8:in `<main>'
Caused by:
Gem::ConflictError: Unable to activate money-6.12.0, because i18n-1.1.0 conflicts with i18n (< 1.1, >= 0.6.4)
/home/omis/spree_simple_sales/Rakefile:5:in `<top (required)>'
bin/rails:8:in `<main>'
Caused by:
LoadError: cannot load such file -- spree/testing_support/extension_rake
/home/omis/spree_simple_sales/Rakefile:5:in `<top (required)>'
bin/rails:8:in `<main>'
如果宝石的版本冲突，我该如何解决此错误