Can you please confirm,if you have created the same domain in the Sandbox.For each community, the network component has a unique name and URL path prefix. When you retrieve the network component, the generated XML file name is based on the name of the network.
So,when we deploy the community it overrides the community in destination org.
I would suggest ...
I have checked in our internal server logs and the actual error message is as below:common.exception.ApiException: Can’t rename the default navigation menu.
In order to fix the issue,we need to clone the changeset(if you are using changeset) and remove the Navigation Set from the component.
Otherwise,you can simply remove the component from the payload for ...
Whitespace and indentation are significant in YAML. This mapping file isn't valid and would result in CumulusCI missing information and misunderstanding your intent.
A correctly-formatted version of your file (not tested, just formatted) would look like this: