I had the same problem. After reinstall of learnpress message disappeared, but I noticed more problems:
– if I create new course and set course price in course list and in course view windows price is Free, only in edit mode I can see prices.
– after reinstall all course info stayed as it was before (I thought it should be deleted)
– I tried to duplicate one course and 2 copies of that course was created
– I had 4 courses created, in one course external link to buy course worked, in other 3 courses stopped working, always go to checkout page
– I couldn’t change Author of any course
– in one course one instructor was missing I couldn’t choose him (co instructors plugin)
I think all the problems could be related to the database update failure. So far I restored my website from backup and I will wait until this upgrade will be fixed and better tested.
