Linh Nguyen My
Jul 29, 2017 · 1 min read

Hi Andy,

I’m currently doing this tutorial but I keep getting this error when doing rackup -p 5000:

undefined method `include’ for #<Rack::Builder:0x007fe87420b1b0> (NoMethodError)

from /Users/linhnguyenmy/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/rack-2.0.3/lib/rack/builder.rb:55:in `instance_eval’

I have already included the following line:

require “facebook/messenger”
include Facebook::Messenger

and have the gem installed

    Linh Nguyen My

    Written by

    A Self-taught Software Engineer @LEGO, prev @ASOS. Also interested in UI. You can find me @ pinglinh.com