为什么我在UTF-8中得到无效的字节序列

为什么我会收到此错误？

invalid byte sequence in UTF-8

用于加载图像:

= image_tag 'features_home/show1.png'

编辑

我注意到这个问题发生在我之后bundle update,任何图像都会出现错误..我会尝试在这里添加详细信息:

堆栈跟踪:

  Rendered home/home.html.haml within layouts/application (229.9ms)
Completed 500 Internal Server Error in 1047ms
invalid byte sequence in UTF-8 excluded from capture: DSN not set

ActionView::Template::Error (invalid byte sequence in UTF-8):
    81:           / Carousel items
    82:           .carousel-inner
    83:             .active.item
    84:               = image_tag 'features_home/show1.png'
    85:               -#.carousel-caption
    86:               -#  %h4
    87:               -#  %p
  app/views/home/home.html.haml:84:in `block in _app_views_home_home_html_haml__623651309533727079_70331260863620'
  app/views/home/home.html.haml:33:in `_app_views_home_home_html_haml__623651309533727079_70331260863620'
  lib/rack/seoredirect.rb:20:in `call'


  Rendered /Users/Apple/.rvm/gems/ruby-2.2.2@myapp/gems/actionpack-4.2.0/lib/action_dispatch/middleware/templates/rescues/_source.erb (115.6ms)
  Rendered /Users/Apple/.rvm/gems/ruby-2.2.2@myapp/gems/actionpack-4.2.0/lib/action_dispatch/middleware/templates/rescues/_trace.html.erb (23.1ms)
  Rendered /Users/Apple/.rvm/gems/ruby-2.2.2@myapp/gems/actionpack-4.2.0/lib/action_dispatch/middleware/templates/rescues/_request_and_response.html.erb (1.7ms)
  Rendered /Users/Apple/.rvm/gems/ruby-2.2.2@myapp/gems/actionpack-4.2.0/lib/action_dispatch/middleware/templates/rescues/template_error.html.erb within rescues/layout (237.9ms)

之前和之后的Gemfile.lock bundle update:https://gist.github.com/hopewise/35c2a98b13ac646b65770feb2f3c7ec8

完整跟踪:https: //gist.github.com/hopewise/551169518a5938647dc767d3de393cd4

我不知道哪个宝石造成了这个问题..