Did you forget to include an optional plugin when you upgraded? I'm guessing maybe this one...
https://moodle.org/plugins/availability_badge
See Site administration > Plugins > Plugins overview. Any "missing plugins" will be highlighted in red.
Did you forget to include an optional plugin when you upgraded? I'm guessing maybe this one...
https://moodle.org/plugins/availability_badge
See Site administration > Plugins > Plugins overview. Any "missing plugins" will be highlighted in red.