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This in in continuation of the problem I had before....
http://gsfn.us/t/33c5h
Basically, the return message is now populating regardless of whether or not the name is valid.
I wanted the return message to populate ONLY if the name is invalid.
It worked and then stopped working?
Well, here's what happened. I put in the javascript code you provide (thanks again).
I tested it by putting in a name that I knew would be invalid (like Knty). Sure enough, the message populated just as it was suppose to saying "that name is not exist".
So I thought it worked fine. Hence my premature happiness 
Then I tried the app using a name I knew to be valid (like Bob). The app displayed the info related to the name (which it's suppose to), AND it also populated the error message.
Maybe I have it mapped wrong???
Just to clarify, before I put in that javascript, the app would populate the standard 404 message if the name did not exist. It would NOT populate if the name did exist.
This worked fine.
The purpose of the javascript was to change the message if there was an error.
Can you attach a screen shot of your response mapping?
Here ya go.
What do you have in Change JavaScript?
return "You new message";
return "That name does not exist";
Add this before the return statement and let me know what you get:
alert ('['+value+']');