Since upgrading to Moodle 3.10 I've discovered that three courses we have that use the Horario Block cannot be accessed, giving this error:
I can't uninstall the block either as that gives errors too. I have a backup of the server from before the last upgrade which I'm currently restoring to see if I can get into these courses and back them up, but - does anyone have any ideas how to properly resolve this, please?