on Configuration > Server > Log your software say:
Specifies when the current log file needs to be rolled over, also known as log rotation. When the file size is over the rollover limit, the active log file will be renamed to log_name.mm_dd_yyyy(.sequence) in the same directory and a new active log file will be created. The actual size of the rotated log file could be a little bigger. Set to 0 to disable log rotation.
Syntax: Integer number"
If we set to zero we obtain following error:
number >= 1M
*number is less than the minumum required