Yes sure it is one time issue only after panel install, then log filling with data and no such error happen. . Yes Cosmetic. But Plesk is not cheap panel compared to free ones. So no cosmetic issues must be. Right?
This is when clear log with
echo "" > panel.log
Command
This is when clear...
Update:
Clear panel.log with command :
> panel.log
It will show 500 error
Clear panel log with command:
echo "" > panel.log
It will show no error
So wrong initial instance of panel.Log when installing fresh plesk.