kill: invalid option -- '9'

[map7]

I'm getting this error after running protractor through protractor-rails rake task like so

bundle exec rake protractor:spec nolog=y

Error I get;

kill protractor rails tests server...
kill webdriver server...
[2015-07-15 15:25:42] FATAL SignalException: SIGTERM
    /usr/local/rbenv/versions/2.1.5/lib/ruby/2.1.0/webrick/server.rb:170:in `select'
    /usr/local/rbenv/versions/2.1.5/lib/ruby/2.1.0/webrick/server.rb:170:in `block in start'
    /usr/local/rbenv/versions/2.1.5/lib/ruby/2.1.0/webrick/server.rb:32:in `start'
    /usr/local/rbenv/versions/2.1.5/lib/ruby/2.1.0/webrick/server.rb:160:in `start'
    /usr/local/rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rack-1.4.7/lib/rack/handler/webrick.rb:13:in `run'
    /usr/local/rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rack-1.4.7/lib/rack/server.rb:268:in `start'
    /usr/local/rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/railties-3.2.21/lib/rails/commands/server.rb:70:in `start'
    /usr/local/rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/railties-3.2.21/lib/rails/commands.rb:55:in `block in <top (required)>'
    /usr/local/rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/railties-3.2.21/lib/rails/commands.rb:50:in `tap'
    /usr/local/rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/railties-3.2.21/lib/rails/commands.rb:50:in `<top (required)>'
    script/rails:6:in `require'
    script/rails:6:in `<main>'
[2015-07-15 15:25:42] INFO  going to shutdown ...
[2015-07-15 15:25:42] INFO  WEBrick::HTTPServer#start done.
Exiting

kill left over selenium processes...
Selenium Standalone has exited with code null
kill: invalid option -- '9'

Usage:
 kill [options] <pid> [...]

Options:
 <pid> [...]            send signal to every <pid> listed
 -<signal>, -s, --signal <signal>
                        specify the <signal> to be sent
 -l, --list=[<signal>]  list all signal names, or convert one to a name
 -L, --table            list all signal names in a nice table

 -h, --help     display this help and exit
 -V, --version  output version information and exit

For more details see kill(1).