Hi Justin,
Thanks for using our plugins and welcome to the forums!
If I understand correctly you get that error message when you have all the following activated?
- The Events Calendar
- Events Calendar PRO
- Event Tickets
- Event Tickets Plus
- Advanced Post Manager
Please note that APM will not work unless Events Calendar PRO is activated.
I can’t see the number of sales for the events in this overview anymore either
Make sure that PRO is activated. Then make sure that you have ‘Sales’ included in the Active Columns part. (screenshot) (After adding columns you will need to click the ‘Apply’ button.)
Cheers,
Andras