error with sar

hello

when i want to launch tha sar command with some arguments, i have this message :
sar -mu -P ALL
sar: 0551-201 Cannot open /var/adm/sa/sa08.
sar: 0551-213 Try running /usr/lib/sa/sa1 <increment> <number>

if I look in /var/adm/sa, there is nothing, no file.
the sar 2 5 is available.

thank you

try:

sar -mu -P ALL <interval> <number of samples>

i have add:
/usr/lib/sa/sa1
/usr/lib/sa/sa2
in the cron
it's ok now