Patience, grasshopper.

Public service for Ruby on Rails programmers:

If you come across an error that looks like this: NoMethodError (undefined method `-@’ for “”:String), and you can’t figure out why your code isn’t working, make sure you don’t have any uncommented lines of non-code in your source.  I feel like an idiot now.  Hopefully this will help someone who happens to have the same problem and googles it.