That link takes to web site of “ADSB Receiver Project” at http://www.adsbreceiver.net , and it does not work with me also. Dont bother about it, as it has nothing to do with your Pi.
Seems Radarbox24 feeder has crashed for some reason.
Reboot your Pi and try again.
Sorry I was being thick - I’ve found the performance graphs now but still no joy with FR24 after a reboot
Do I need to use the workaround suggested in one of your earlier posts because I’ve got Raspbian Stretch Lite installed on my Pi?
Yes, first install dirmngr
sudo apt-get update
sudo apt-get install dirmngr
sudo rebootNow check if < ip of pi >:8754 works. If not uninstall fr24 feeder first
sudo dpkg --purge fr24feedNow reinstall FR24 feeder.
All sorted and running now.
Once again, thank you very much, your help is very much apprecaited