This is the brand-new version of sysstat released today. The hourly cron job now fails because /usr/lib/sa/sa1 runs "/usr/lib/sa/sadc 1 1 /var/log/sa/sa25" which then errors out with the above message. Is this a file format change between sysstat versions, or did you guys just not test this rpm release at all?
It is reporting an invalid system activity file after analyzing the file from the previous day (which was created by the old broken package). You should not see any more of these after this.