Pythonanywhere Hosting issue

Hello, 

my site is hosted on pythonanywhere.com. As per this tutorial https://help.pythonanywhere.com/pages/UsingANewDomainForExistingWebApp

I have changed the previous configuration from username.pythonanywhere.com to www.mydomain.com. There was a CNAME value webapp-XXXX.pythonanywhere.com

I bought my domain name from godaddy registrar. I am having an issue with managing DNS record. When i try to add the record

Type: CNAME

Host: www

Points to: webapp-XXXX.pythonanywhere.com

TTL: 1 Hr

It says "The specified CNAME already exist in the zone". 

And then when i try to load www,mydomain.com, it shows a page from the godaddy site instead of my HomePage

Please anyhelp will be appreciated

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