For what it's worth I am witrh Colin on this but this is covered in the 
foot note on page 46 of the pdf

6. If instead you see a message to the effect of No route matches 
"/say/hello", try stopping and
restarting your server, because something you have done caused Rails to 
cache your configuration
information before the controller was created.

The point made on the page you are talking about (p159 on the pdf) I 
guess is a hang over from previous vewrsions of the book that dealt with 
old versions of rails but it's a good lesson to learn. Always restart 
your server if you get unexpected results and after making a lot of 
changes. It takes no time to do and can save a lot of heartache trying 
to debug code that has no bugs!
-- 
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