Hello Liam,
Well, Corporate Site website template contains some contact roles which system tries to import during site setup. However, Contact management is not available in Ultimate license, that is why you are getting those errors (Kentico 8 - Feature Matrix).
A solution in your case should be to exclude contact roles and statuses in Step 4 of the new site creation wizard. Please see the attached screenshot for more details.
Hopefully this should help you get rid of the errors.