Do you have one or more schedules in your Virtuagym license but you go to the Schedule app and you see the following message?
That means you have not created the schedule itself in Business Settings > Schedule Settings.
Remember that before adding activities to the schedule, is mandatory to create the schedule from the Business Settings in order to have it in the Schedule App. Once the schedule is created and set as you want, you will be able to use it.
If you want more information regarding this, have a look HERE.