"rails server" => "warning: array values in the parameter are deprecated"

[superstrong]

rails server

Array values in the parameter are deprecated. Please use a String or nil.
An Array was passed in from bin/rails:3:in load
=> Booting WEBrick
=> Rails 4.2.0 application starting in development on http://localhost:3000
=> Run rails server -h for more startup options
=> Ctrl-C to shutdown server
[2016-02-28 14:49:17] INFO WEBrick 1.3.1
[2016-02-28 14:49:17] INFO ruby 2.2.0 (2014-12-25) [x86_64-darwin14]
[2016-02-28 14:49:17] INFO WEBrick::HTTPServer#start: pid=41589 port=3000