私はこの Railscast チュートリアルに従っており、すべての手順を正しく実行したと確信していますが、 cap rubra:create_staging を実行すると、次のエラーが発生します。
これをデバッグするためにどこから始めるべきかさえわかりません。
The key pair 'gsg-keypair' does not exist (Fog::Compute::AWS::NotFound)
from /Users/anderskitson/.rbenv/versions/1.9.3-p374/lib/ruby/gems/1.9.1/gems/excon-0.20.1/lib/excon/connection.rb:332:in `response'
from /Users/anderskitson/.rbenv/versions/1.9.3-p374/lib/ruby/gems/1.9.1/gems/excon-0.20.1/lib/excon/connection.rb:226:in `request'
from /Users/anderskitson/.rbenv/versions/1.9.3-p374/lib/ruby/gems/1.9.1/gems/fog-1.10.0/lib/fog/core/connection.rb:21:in `request'
from /Users/anderskitson/.rbenv/versions/1.9.3-p374/lib/ruby/gems/1.9.1/gems/fog-1.10.0/lib/fog/aws/compute.rb:384:in `_request'
from /Users/anderskitson/.rbenv/versions/1.9.3-p374/lib/ruby/gems/1.9.1/gems/fog-1.10.0/lib/fog/aws/compute.rb:379:in `request'
from /Users/anderskitson/.rbenv/versions/1.9.3-p374/lib/ruby/gems/1.9.1/gems/fog-1.10.0/lib/fog/aws/requests/compute/run_instances.rb:119:in `run_instances'
from /Users/anderskitson/.rbenv/versions/1.9.3-p374/lib/ruby/gems/1.9.1/gems/fog-1.10.0/lib/fog/aws/models/compute/server.rb:173:in `save'
from /Users/anderskitson/.rbenv/versions/1.9.3-p374/lib/ruby/gems/1.9.1/gems/fog-1.10.0/lib/fog/core/collection.rb:52:in `create'
from /Users/anderskitson/.rbenv/versions/1.9.3-p374/lib/ruby/gems/1.9.1/gems/rubber-2.2.4/lib/rubber/cloud/fog.rb:27:in `create_instance'
from /Users/anderskitson/.rbenv/versions/1.9.3-p374/lib/ruby/gems/1.9.1/gems/rubber-2.2.4/lib/rubber/thread_safe_proxy.rb:13:in `method_missing'
from /Users/anderskitson/.rbenv/versions/1.9.3-p374/lib/ruby/gems/1.9.1/gems/rubber-2.2.4/lib/rubber/recipes/rubber/instances.rb:310:in `create_instance'
from /Users/anderskitson/.rbenv/versions/1.9.3-p374/lib/ruby/gems/1.9.1/gems/rubber-2.2.4/lib/rubber/recipes/rubber/instances.rb:230:in `block (2 levels) in create_instances'