So I tried generalization in the Administration Domain Model, and since it didn't do what I thought it would do, I selected generalization > none. Now I am left with 45 errors everywhere because it doesn't roll back the changes it makes when generalizing. Is this supposed to happen? As a starting Mendix user this is really frustrating.
If you right click on the Domain Model, you can select Revert change. This should roll back your modifications.