Install document currently says:
Ruby 2.0+ (we recommend 2.0.0-p353 or higher)
Actually, Ruby 2.0.0 won’t work. When I tried I got an error from the Sidekiq gem:
uninitialized constant Sidekiq::Sinatra
This was coming from
module Sidekiq class Web < Sinatra::Base --------------^
sinatra/base is required above. While I don’t know Ruby, I guessed that this is a language incompatibility. And indeed, the error went away after switching to Ruby 2.1.2.