From my POV, the user argument is missing. It should look like this:
SHELL=/bin/sh PATH=/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin
00 08-18/1 * * * root sarg-reports today 00 00 * * * root sarg-reports daily 00 01 * * 1 root sarg-reports weekly 30 02 1 * * root sarg-reports monthly
From my POV, the user argument is missing. It should look like this:
SHELL=/bin/sh /sbin:/ usr/bin: /usr/sbin: /usr/local/ bin:/usr/ local/sbin
PATH=/bin:
00 08-18/1 * * * root sarg-reports today
00 00 * * * root sarg-reports daily
00 01 * * 1 root sarg-reports weekly
30 02 1 * * root sarg-reports monthly