wrong number of arguments error

[treeder]

Copied code exactly from your blog post example: http://www.hightechinthehub.com/2012/03/programmatically-retrieving-aws-pricing/

Got this:

/worker/bundle/ruby/2.1.0/gems/amazon-pricing-0.1.63/lib/amazon-pricing/aws-price-list.rb:51:in `get_instance_type': wrong number of arguments (3 for 2) (ArgumentError)