CRM 2013 Unattended Install: Backend Installation: Check WebServerValidator: The Website does not exist.

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It took a while to figure this one out, given that I am not a CRM specialist. If you define that the backend server contains the DeploymentWebServiceRole, you also need to define the WebsiteUrl parameters in the xml file. If you don’t, you will get the above error that doesn’t really explain that it is missing something in the configuration file.