Why I cannot create an application with scaling in OpenShift Enterprise 2.0?

Solution Verified - Updated -

Issue

When creating a scalable application (either via Management Console or rhc), I'm receiving the following error:

$ rhc --trace create-app lb php-5.3 --scaling

Application Options
-------------------
  Domain:     redhat
  Cartridges: php-5.3
  Gear Size:  default
  Scaling:    yes

Creating application 'lb' ... /usr/share/gems/gems/rhc-1.16.9/lib/rhc/rest/client.rb:621:in `handle_error!': Unable to complete the requested operation due to: Failed to correctly execute all parallel operations. (RHC::Rest::ServerErrorException)
Reference ID: 1c150dbe915e248b875d1d0e3e049e8b
        from /usr/share/gems/gems/rhc-1.16.9/lib/rhc/rest/client.rb:282:in `block in request'
        from /usr/share/gems/gems/rhc-1.16.9/lib/rhc/rest/client.rb:264:in `block in attempt'
        from /usr/share/gems/gems/rhc-1.16.9/lib/rhc/rest/client.rb:263:in `each'
        from /usr/share/gems/gems/rhc-1.16.9/lib/rhc/rest/client.rb:263:in `attempt'
        from /usr/share/gems/gems/rhc-1.16.9/lib/rhc/rest/client.rb:270:in `request'
        from /usr/share/gems/gems/rhc-1.16.9/lib/rhc/rest/base.rb:28:in `rest_method'
        from /usr/share/gems/gems/rhc-1.16.9/lib/rhc/rest/domain.rb:67:in `add_application'
        from /usr/share/gems/gems/rhc-1.16.9/lib/rhc/commands/app.rb:504:in `create_app'
        from /usr/share/gems/gems/rhc-1.16.9/lib/rhc/commands/app.rb:109:in `block in create'
        from /usr/share/gems/gems/rhc-1.16.9/lib/rhc/highline_extensions.rb:190:in `call'
        from /usr/share/gems/gems/rhc-1.16.9/lib/rhc/highline_extensions.rb:190:in `section'
        from /usr/share/gems/gems/rhc-1.16.9/lib/rhc/highline_extensions.rb:204:in `paragraph'
        from /usr/share/gems/gems/rhc-1.16.9/lib/rhc/helpers.rb:306:in `block (2 levels) in <module:Helpers>'
        from /usr/share/gems/gems/rhc-1.16.9/lib/rhc/commands/app.rb:105:in `create'
        from /usr/share/gems/gems/rhc-1.16.9/lib/rhc/commands.rb:285:in `execute'
        from /usr/share/gems/gems/rhc-1.16.9/lib/rhc/commands.rb:276:in `block (3 levels) in to_commander'
        from /usr/share/gems/gems/commander-4.1.2/lib/commander/command.rb:180:in `call'
        from /usr/share/gems/gems/commander-4.1.2/lib/commander/command.rb:180:in `call'
        from /usr/share/gems/gems/commander-4.1.2/lib/commander/command.rb:155:in `run'
        from /usr/share/gems/gems/commander-4.1.2/lib/commander/runner.rb:400:in `run_active_command'
        from /usr/share/gems/gems/rhc-1.16.9/lib/rhc/command_runner.rb:102:in `run!'
        from /usr/share/gems/gems/commander-4.1.2/lib/commander/delegates.rb:7:in `run!'
        from /usr/share/gems/gems/rhc-1.16.9/lib/rhc/cli.rb:37:in `start'
        from /usr/share/gems/gems/rhc-1.16.9/bin/rhc:20:in `<top (required)>'
        from /usr/bin/rhc:23:in `load'
        from /usr/bin/rhc:23:in `<main>'

What is the problem and how to fix this?

Environment

OpenShift Enterprise 2.0

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