After update OMP from 3.1.1.3 to 3.3.0.13 version, when we try to open the “Activity Log” don't show activity logs

Software Support Open Monograph Press
5

i found this

i change “display_errors = Off” to “display_errors = On” ,and now the “Activity Logs” appears.

i dont understand.
can anyone explain why turn "display_errors = on ", make Activity Logs to show?