Rails helper_method :my_method not called

All,

I have created a rails 3 application using version 3.0.6 and 3.0.9 and
added the following helper declaration to the ApplicationController as
follows:

helper_method :my_method

However this method is never invoked when any of my controllers are
called (even though they extend ApplicationController).

This worked in rails 2.3.8 but not in the rails 3 versions - is it
deprecated?

Any help greatly appreciated.

Thanks

Solved - looks like I had an error in one of my config files.

Thanks