/usr/sbin/apachectl: line 82: ulimit: open files: cannot modify limit: Invalid argument
So I opened the script and found that there is something wrong with $ULIMIT_MAX_FILES
The error message says that 'cannot modify limit' so i changed its value to empty string
# ULIMIT_MAX_FILES="ulimit -S -n `ulimit -H -n`"
Voila, it works, but deeper investigation need.