Found this line in apache log. Actually many of them.
All of them with the same parent class named
 MMCACHE can't restore parent class "parent_class" of
So what's the problem?
Logged In: YES
The problem is in the order of included files. Always use the
same include file order.
For you case: do include file with "parent_class" befor the file
This BUG can't be fixed by MMCache with ZE1.
I hope, I have fixed this bug in release 2.3.21. Please, check
it and let me know about the result.