How could I redirect a root level domain to www subdomain with Zerigo DNS on Heroku? [closed]

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I'm having trouble redirecting my root domain to a www subdomain ((e.g. blahblahblah.com to www.blahblahblah.com). I've a web app hosted on Heroku for which I've modified DNS settings through Zerigo DNS.

These are my current settings:

However, this is the error I am getting when I type in, say, blahblahblah.com:

Is there a problem with how things are currently set up, or is there anything else that I need to do in order for the redirect to work?

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you're getting a DNS error not a Heroku error so it could just be taking it's time to propagate