“bundle exec rake daemons:start” now giving a “: No such file or directory” error

[tawandakembo]

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I have a Ruby on Rails app that depends on a number of daemons to work properly. It was working fine but I can't figure out what I changed to make it stop working. Now when I run the following command:

$ bundle exec rake daemons:start
I get the following error:

/home/deploy/bitcoinfundi/current/vendor/bundle/ruby/2.2.0/gems/figaro-1.1.1/lib/figaro/application.rb:84:in `non_string_configuration!' : WARNING: Use strings for Figaro configuration. 60 was converted to "60". (StandardWarning)
/home/deploy/bitcoinfundi/current/vendor/bundle/ruby/2.2.0/gems/figaro-1.1.1/lib/figaro/application.rb:84:in `non_string_configuration!' : WARNING: Use strings for Figaro configuration. 587 was converted to "587". (StandardWarning)
/home/deploy/bitcoinfundi/current/vendor/bundle/ruby/2.2.0/gems/figaro-1.1.1/lib/figaro/application.rb:84:in `non_string_configuration!' : WARNING: Use strings for Figaro configuration. 8080 was converted to "8080". (StandardWarning)
/home/deploy/bitcoinfundi/current/vendor/bundle/ruby/2.2.0/gems/figaro-1.1.1/lib/figaro/application.rb:84:in `non_string_configuration!' : WARNING: Use strings for Figaro configuration. 4567 was converted to "4567". (StandardWarning)
/home/deploy/bitcoinfundi/current/vendor/bundle/ruby/2.2.0/gems/figaro-1.1.1/lib/figaro/application.rb:84:in `non_string_configuration!' : WARNING: Use strings for Figaro configuration. 8080 was converted to "8080". (StandardWarning)
/home/deploy/bitcoinfundi/current/vendor/bundle/ruby/2.2.0/gems/figaro-1.1.1/lib/figaro/application.rb:84:in `non_string_configuration!' : WARNING: Use strings for Figaro configuration. 8080 was converted to "8080". (StandardWarning)
/home/deploy/bitcoinfundi/current/vendor/bundle/ruby/2.2.0/gems/figaro-1.1.1/lib/figaro/application.rb:84:in `non_string_configuration!' : WARNING: Use strings for Figaro configuration. true was converted to "true". (StandardWarning)
/home/deploy/bitcoinfundi/current/vendor/bundle/ruby/2.2.0/gems/figaro-1.1.1/lib/figaro/application.rb:84:in `non_string_configuration!' : WARNING: Use strings for Figaro configuration. 15129007520 was converted to "15129007520". (StandardWarning)
/home/deploy/bitcoinfundi/current/vendor/bundle/ruby/2.2.0/gems/figaro-1.1.1/lib/figaro/application.rb:84:in `non_string_configuration!' : WARNING: Use strings for Figaro configuration. false was converted to "false". (StandardWarning)
/home/deploy/bitcoinfundi/current/vendor/bundle/ruby/2.2.0/gems/figaro-1.1.1/lib/figaro/application.rb:84:in `non_string_configuration!' : WARNING: Use strings for Figaro configuration. 3820920586 was converted to "3820920586". (StandardWarning)
/home/deploy/bitcoinfundi/current/vendor/bundle/ruby/2.2.0/gems/figaro-1.1.1/lib/figaro/application.rb:84:in `non_string_configuration!' : WARNING: Use strings for Figaro configuration. false was converted to "false". (StandardWarning)
: No such file or directory

If it helps the only thing I suspect could have cause this was upgrading the the rails gem from version 4.1.25 to version 4.2.5 - but I'm not sure whether this could be the cause. How can I troubleshoot this.