Upgrading Zerigo DNS plan through Heroku failure

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http://serverfault.com – I'm hosting an app on Heroku and have a basic DNS plan with Zerigo. I tried to upgrade the Zerigo plan from "basic" to "tier 1" through the Heroku command line tool and received the following error: Hostname may not be assigned to both a CNAME and other record types at the same time (the CNAME would override all other record types with the same hostname anyway) Can anyone help me understand this error message, or has anyone experienced this issue firsthand? (HowTos)