> test.rb:8: undefined method `yaml_save' for main:Object (NoMethodError)
>
> yaml_save was the method I had tried to use.
> Any thoughts? Suggestions? Flames?

The code that cause this issue would be nice... but it looks like you
are calling it from an Object something like this:

a = Object.new
a.yaml_save

Anyway, this message is saying that the method that you are trying to
call could not be found (i.e. it's undefined).  Try this:

a = Object.new
a.asdf

Same error...