Rake Task to Restart Heroku Server - ruby-on-rails

Question

I'm trying to create a rake task that restarts my heroku servier. I've found this post, which has helped immensely: http://railspikes.com/2010/2/13/rake-task-for-deploying-to-heroku.
I've cobbled together this rake task, but it's giving me an error. The rake abouts and I get the message:
uninitialized constant Heroku::Command::BaseWithApp.
This is my method.
desc 'restarts the server'
task restart_server: :environment do
require 'heroku'
require 'heroku/command'
user, pass = File.read(File.expand_path("~/.heroku/credentials.txt")).split("\n")
heroku = Heroku::Client.new(user, pass)
cmd = Heroku::Command::BaseWithApp.new([])
remotes = cmd.git_remotes(File.dirname(__FILE__) + "/../..")
remote, app = remotes.detect {|key, value| value == (ENV['APP'])}# || cmd.app)}
if remote.nil?
raise "Could not find a git remote for the '#{ENV['APP']}' app"
end
heroku.restart(ENV['APP'])
end
I'm not sure why it's rejecting Heroku::Command. The app is already live on Heroku, so I know it's Heroku compliant.
Any advice?
EDIT: Here's my stack trace.
** Invoke restart_server (first_time)
** Invoke environment (first_time)
** Execute environment
** Execute restart_server
rake aborted!
uninitialized constant Heroku::Command::BaseWithApp
/Users/bendowney/Sites/ProblemChildApp/lib/tasks/scheduler.rake:51:in `block in <top (required)>'
/Users/bendowney/.rvm/gems/ruby-1.9.3-p194#global/gems/rake-0.9.2.2/lib/rake/task.rb:205:in `call'
/Users/bendowney/.rvm/gems/ruby-1.9.3-p194#global/gems/rake-0.9.2.2/lib/rake/task.rb:205:in `block in execute'
/Users/bendowney/.rvm/gems/ruby-1.9.3-p194#global/gems/rake-0.9.2.2/lib/rake/task.rb:200:in `each'
/Users/bendowney/.rvm/gems/ruby-1.9.3-p194#global/gems/rake-0.9.2.2/lib/rake/task.rb:200:in `execute'
/Users/bendowney/.rvm/gems/ruby-1.9.3-p194#global/gems/rake-0.9.2.2/lib/rake/task.rb:158:in `block in invoke_with_call_chain'
/Users/bendowney/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/monitor.rb:211:in `mon_synchronize'
/Users/bendowney/.rvm/gems/ruby-1.9.3-p194#global/gems/rake-0.9.2.2/lib/rake/task.rb:151:in `invoke_with_call_chain'
/Users/bendowney/.rvm/gems/ruby-1.9.3-p194#global/gems/rake-0.9.2.2/lib/rake/task.rb:144:in `invoke'
/Users/bendowney/.rvm/gems/ruby-1.9.3-p194#global/gems/rake-0.9.2.2/lib/rake/application.rb:116:in `invoke_task'
/Users/bendowney/.rvm/gems/ruby-1.9.3-p194#global/gems/rake-0.9.2.2/lib/rake/application.rb:94:in `block (2 levels) in top_level'
/Users/bendowney/.rvm/gems/ruby-1.9.3-p194#global/gems/rake-0.9.2.2/lib/rake/application.rb:94:in `each'
/Users/bendowney/.rvm/gems/ruby-1.9.3-p194#global/gems/rake-0.9.2.2/lib/rake/application.rb:94:in `block in top_level'
/Users/bendowney/.rvm/gems/ruby-1.9.3-p194#global/gems/rake-0.9.2.2/lib/rake/application.rb:133:in `standard_exception_handling'
/Users/bendowney/.rvm/gems/ruby-1.9.3-p194#global/gems/rake-0.9.2.2/lib/rake/application.rb:88:in `top_level'
/Users/bendowney/.rvm/gems/ruby-1.9.3-p194#global/gems/rake-0.9.2.2/lib/rake/application.rb:66:in `block in run'
/Users/bendowney/.rvm/gems/ruby-1.9.3-p194#global/gems/rake-0.9.2.2/lib/rake/application.rb:133:in `standard_exception_handling'
/Users/bendowney/.rvm/gems/ruby-1.9.3-p194#global/gems/rake-0.9.2.2/lib/rake/application.rb:63:in `run'
/Users/bendowney/.rvm/gems/ruby-1.9.3-p194#global/gems/rake-0.9.2.2/bin/rake:33:in `<top (required)>'
/Users/bendowney/.rvm/gems/ruby-1.9.3-p194#global/bin/rake:19:in `load'
/Users/bendowney/.rvm/gems/ruby-1.9.3-p194#global/bin/rake:19:in `<main>'
/Users/bendowney/.rvm/gems/ruby-1.9.3-p194#ProblemChildApp/bin/ruby_noexec_wrapper:14:in `eval'
/Users/bendowney/.rvm/gems/ruby-1.9.3-p194#ProblemChildApp/bin/ruby_noexec_wrapper:14:in `<main>'
Tasks: TOP => restart_server