Schedule {
  Name = "argon-schedule"
  Run = Full mon at 01:00 
  Run = Differential tues-sun at 01:00
}

reults in:

27-Dec 19:09 bacula-dir: ERROR TERMINATION at run_conf.c:515
Config error: Invalid month, week or position day range
            : line 4, col 29 of file /etc/bacula/includes/schedules/argon.vsn1.com.conf
  Run = Differential tues-sun at 01:00