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