The error message: The active deployment configuration 'Deploy App for SharePoint' cannot be located. Specify a valid deployment configuration in the Project Properties.
The message is fine. It tells you what to do. I guess, changing the property automatically is too much to ask.
The arrow for the property is grayed out in the Property window :-)
The Solution:
1. Right-click on your project in Solution Explorer
2. Select "SharePoint" and change the value to "...Add-in..." in the "Active Depl. Conf." drop-down
