Error: Service check command ‘check_users’ specified in service ‘check_mem’ for host ‘station10’ not defined anywhere!

define command{
command_name check_nrpe
command_line $USER1$/check_nrpe -H $HOSTADDRESS$ -c $ARG1$
}

mine service example:

define service{
use generic-service
host_name station10
service_description Root_Monitoring
contact_groups admins
check_command check_nrpe!check_disk!5%!10%!/
max_check_attempts 8
}