The book is probably too advanced for me. I get this error strait from the start:
render pdf: "contents", template: "path/to/template"
You have one or more invalid gemspecs that need to be fixed. The gemspec at /home/ubuntu/workspace/pdf_renderer/pdf_renderer.gemspec is not valid. Please fix this gemspec. The validation error was ‘“FIXME” or “TODO” is not a description’
I use Cloud 9 for learning/development.