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How to solve "cannot load such file -- rack/handler/0"

Written By Corlew Solutions
Updated September 6, 2016
Published August 25, 2016
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Article Technology Info

This article discusses the following technologies:

  • Ruby on Rails - An open source web application framework written in Ruby.
    (website | docs)

If you get an error that looks like

1
.../lib/rack/handler.rb:75:in `require': cannot load such file -- rack/handler/0 (LoadError)

make sure you’re starting your Rails server correctly. You may be doing

1
rails s -b 0 0 0 0

instead of

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rails s -b 0.0.0.0

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