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/Users/ct/.rvm/gems/ruby-2.1.1/gems/headless-1.0.2/lib/headless/cli_util.rb:9:in ensure_application_exists!': Xvfb not found on your system (Headless::Exception)
from /Users/ct/.rvm/gems/ruby-2.1.1/gems/headless-1.0.2/lib/headless.rb:68:ininitialize'
from c_1319.rb:9:in new'
from c_1319.rb:9:in'
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Xvfb or X virtual framebuffer is a display server implementing the X11 display server protocol. In contrast to other display servers, Xvfb performs all graphical operations in virtual memory without showing any screen output.
Installing xquartz fixed the problem with me.
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