How do I deploy a Heroku app with a private repo sucessfully?
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I can't seem to figure this out.  Any ideas why I may be getting the following error?

    kamilski81:~/Sites/sc:ruby-1.9.3@sc:(master)
    $ git push staging master:master
    Counting objects: 31, done.
    Delta compression using up to 8 threads.
    Compressing objects: 100% (16/16), done.
    Writing objects: 100% (16/16), 1.89 KiB, done.
    Total 16 (delta 9), reused 0 (delta 0)
    
    -----> Heroku receiving push
    -----> Ruby/Rails app detected
    -----> Using Ruby version: ruby-1.9.3
    -----> Installing dependencies using Bundler version 1.2.0.rc
           Running: bundle install --without development:test --path vendor/bundle --binstubs bin/ --deployment
           You are trying to install in deployment mode after changing
           your Gemfile. Run `bundle install` elsewhere and add the
           updated Gemfile.lock to version control.
           You have added to the Gemfile:
           * source: https://github.com/sc/SC-Models.git (at master)
           You have deleted from the Gemfile:
           * source: https://git_username:git_password@github.com/sc/SC-Models.git (at master)
           You have changed in the Gemfile:
           * sc_models from `https://github.com/sc/SC-Models.git (at master)` to `no specified source`
     !
     !     Failed to install gems via Bundler.
     !
     !     Heroku push rejected, failed to compile Ruby/rails app
    
    To git@heroku.com:pi-staging.git
     ! [remote rejected] master -> master (pre-receive hook declined)
    error: failed to push some refs to 'git@heroku.com:pi-staging.git'
    kamilski81:~/Sites/sc:ruby-1.9.3@sc:(master)