If you get generic errors like this, you can find details in logs.
Log path : C:\Users\crmadminuser\AppData\Roaming\Microsoft\MSCRM\Logs\crmserversetup.txt
WebsiteBindingsValidator : Failure: Object reference not set to an instance of an object.
- Check web site on IIS
- Add new Web site for CRM
- Or select default web site from crm setup wizard.