The FlightBooking application uses OData to access the SAP Demo server. I'm the only one using the server (its a sandbox development server) so no one would be accessing the system but me.
I checked the log files immediately after restarting the SMP server. I could be wrong but I think the error occurs when the Work Manager app tries to connect to the backend system.
I'm not sure what is needed (or where) for the backend tab to be populated in the management cockpit for the app.
Thanks,
Dave