$ bundle exec rake maps:generate_recent_thumbs --trace
** Invoke maps:generate_recent_thumbs (first_time)
** Invoke environment (first_time)
** Execute environment
** Execute maps:generate_recent_thumbs
rake aborted!
NoMethodError: undefined method `quit' for nil:NilClass
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/var/www/lilsis/lib/screenshot.rb:19:in `block in take'
/var/www/lilsis/vendor/bundle/ruby/2.3.0/gems/headless-2.3.1/lib/headless.rb:143:in `run'
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/var/www/lilsis/app/models/network_map.rb:196:in `generate_s3_thumb'
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/var/www/lilsis/vendor/bundle/ruby/2.3.0/gems/rake-11.3.0/lib/rake/application.rb:152:in `invoke_task'
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/var/www/lilsis/vendor/bundle/ruby/2.3.0/gems/rake-11.3.0/lib/rake/application.rb:108:in `block in top_level'
/var/www/lilsis/vendor/bundle/ruby/2.3.0/gems/rake-11.3.0/lib/rake/application.rb:117:in `run_with_threads'
/var/www/lilsis/vendor/bundle/ruby/2.3.0/gems/rake-11.3.0/lib/rake/application.rb:102:in `top_level'
/var/www/lilsis/vendor/bundle/ruby/2.3.0/gems/rake-11.3.0/lib/rake/application.rb:80:in `block in run'
/var/www/lilsis/vendor/bundle/ruby/2.3.0/gems/rake-11.3.0/lib/rake/application.rb:178:in `standard_exception_handling'
/var/www/lilsis/vendor/bundle/ruby/2.3.0/gems/rake-11.3.0/lib/rake/application.rb:77:in `run'
/var/www/lilsis/vendor/bundle/ruby/2.3.0/gems/rake-11.3.0/exe/rake:27:in `<top (required)>'
/var/www/lilsis/vendor/bundle/ruby/2.3.0/bin/rake:23:in `load'
/var/www/lilsis/vendor/bundle/ruby/2.3.0/bin/rake:23:in `<top (required)>'
/usr/local/rvm/gems/ruby-2.3.0/gems/bundler-1.13.6/lib/bundler/cli/exec.rb:74:in `load'
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/usr/local/rvm/gems/ruby-2.3.0/gems/bundler-1.13.6/lib/bundler/cli/exec.rb:27:in `run'
/usr/local/rvm/gems/ruby-2.3.0/gems/bundler-1.13.6/lib/bundler/cli.rb:332:in `exec'
/usr/local/rvm/gems/ruby-2.3.0/gems/bundler-1.13.6/lib/bundler/vendor/thor/lib/thor/command.rb:27:in `run'
/usr/local/rvm/gems/ruby-2.3.0/gems/bundler-1.13.6/lib/bundler/vendor/thor/lib/thor/invocation.rb:126:in `invoke_command'
/usr/local/rvm/gems/ruby-2.3.0/gems/bundler-1.13.6/lib/bundler/vendor/thor/lib/thor.rb:359:in `dispatch'
/usr/local/rvm/gems/ruby-2.3.0/gems/bundler-1.13.6/lib/bundler/cli.rb:20:in `dispatch'
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/usr/local/rvm/gems/ruby-2.3.0/gems/bundler-1.13.6/lib/bundler/cli.rb:11:in `start'
/usr/local/rvm/gems/ruby-2.3.0/gems/bundler-1.13.6/exe/bundle:34:in `block in <top (required)>'
/usr/local/rvm/gems/ruby-2.3.0/gems/bundler-1.13.6/lib/bundler/friendly_errors.rb:100:in `with_friendly_errors'
/usr/local/rvm/gems/ruby-2.3.0/gems/bundler-1.13.6/exe/bundle:26:in `<top (required)>'
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/usr/local/rvm/gems/ruby-2.3.0/bin/ruby_executable_hooks:15:in `eval'
/usr/local/rvm/gems/ruby-2.3.0/bin/ruby_executable_hooks:15:in `<main>'