I get the following message trying to install the DreamHouse app:
This app can't be installed.
There are problems that prevent this package from being installed.
Custom Field Definitions(00N6A0000098lS8) Duplicate RelationshipNameThe relationship name "Favorites__r" is already used by custom field Favorite__c.Property__c. Please rename existing relationship name.

How do I fix this?
Thanks,
Eddie