Error: Number of instances found : 0

Hi
I updated the site from Joomla! 3.9.15 to Joomla 4.4.9
using com_migrateme4_4.4.3

I installed PBCK _3.3.7 PRO
Before it was: PBCK 2.9.11 PRO

And I have this message:

PBCK > Pages Libray > H1 Edit item :

ERROR : If you see this message then the function "ckLoadEditionPopup" is missing from the element edition. Please contact the developer
The edition area was not found for the element : heading. Number of instances found : 0

What does this mean and how do I fix it?
PBCK missing Ellements  Print
 

Hi
Please clear your browser cache and try again, then let me know
CEd

It doesn't change anything, it's an interesting case . If you have time, check it out yourself.

I have checked
all your Page Builder CK type plugins are disabled, you can not load the edition for them
you must enable your plugins again

Thank you very much for your help, now everything works fine..