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Guys, what's wrong?

error: Invalid check specified by -x parameter.

but from terminal is okay:
/etc/nagios-plugins/printer_status -H 192.168.0.197 -x "MODEL"
Samsung SCX-472x Series, Serial # Z8Z7BJDC400094K

define command:

define command{
command_name printer_status
command_line /etc/nagios-plugins/printer_status -H $HOSTADDRESS$ -C $ARG1$ -x $ARG2 -w $ARG3$ -c $ARG4$
}

service:
define service{
use generic-service
hostgroup_name printers
service_description Printer_Model
check_command printer_status!public!"MODEL"
}

I believe the wrong is check_command string. But it's the same as aytor's and autor can't lie to us.