Error in crontab file: bad day-of-week

When I run crontab -e on my Debian server and add these lines:

# System statistics
*/10 * * * * /usr/lib/sysstat/sa1 1 1 > /dev/null 2>&1
59 23 * * * /usr/lib/sysstat/sa2 -A > /dev/null 2>&1

after save, the crontab complains:

crontab: installing new crontab
"/tmp/crontab.xSbhwZ/crontab":30: bad day-of-week
errors in crontab file, can't install.

This is line 30: */10 * * * * /usr/lib/sysstat/sa1 1 1 > /dev/null 2>&1. When I comment this line, it’s all fine.

Any thoughts?

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