when teacher begin to edit, it leads to white page as in screen shot
https://prnt.sc/ugh6v2
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I had the same problem. It is due to the Appointment Plugin. You can deactivate it and check.
You are on version 4 and wplms appointments addon is not a compatible version with v4. So please use vibe appointments addon and then check
We have already released the vibe appointments
That is was the last appointments version which is released 2 days ago? or there is a new one?
I deactivate the plugin and the problem is NOT FIXED . edit loads a white page
Vibe Appointments is released two days ago and yes it is the plugin which is compatible with version 4
If you purchased the wplms appointments then you will get this addon for free using wplms appointments license key. Otherwise, you have to purchase this addon
https://wplms.io/downloads/vibe-appointments/
And the issue, edit course is also working fine:
http://prntscr.com/uhnn6r