Issue
You receive an error that "one or more sites isn't geocoded"
Resolution steps
It's possible that you're getting the "isn't geocoded" error because the zone doesn't have an address set. The system needs an address to start from, and since the zone doesn't have one, the error is generated. However, once you add an address to the zone information, you won't receive this error anymore.
Zones > Edit > 'Add zone starting address here'