Thank you for providing the Error you’re receiving. Can you confirm what version of the Player you are using with your Xibo setup?
The error suggests the issue is related to the schedule. If there are any scheduled Events for the Display, can you delete them and then try to delete the Display again please?
If this does not resolve the issue, we would need to see some logs from your CMS to look into this issue further.
To do this, you will need to select the
Report Fault option in your CMS, follow the instructions and click the
Turn on Debugging option when prompted. On the next step, select the
Open a new Window button and within this new window, try to delete the Display. Once the Display has failed to delete, close the window, return to the original window and continue with the Report Fault Steps. You will need to
Collect and Save the logs and finally
Turn off Debugging. You can then send me those Logs in a private message.