You've got it all wrong!
This message is from WWWizer.com, that redirects from example.com to www.example.com
You have to point only www-less A-record to WWWizer.
Record with www must be pointed to your hosting provider.
If you already made this change and still see this message wait until your DNS updates.
Setup for Google App Engine
You need these records in DNS:
| example.com | A | 174.129.25.170 |
| www.example.com | CNAME | ghs.google.com |
And usual mail-related MX-records.
Someone made a mistake and pointed address that includes "www" to WWWizer.
We are not controlling their servers and unable to help in this case.
If you can, please contact site owners and tell them about this problem.
Sorry!