[CentOS] nagios check_local_disk failing

Hey all,

I have a local disk check defined which is giving me an error:

Current Status: UNKNOWN (for 0d 0h 1m 38s)Status Information:Unknown argument Usage: check_disk -w limit -c limit [-W limit] [-K limit] {-p pathPerformance Data:-x device} [-C] [-E] [-e] [-f] [-g group ] [-k] [-l] [-M] [-m] [-R path ] [-r path ] [-t timeout] [-u unit] [-v] [-X type] [-N type] [-n]

I have a local check setup like this in the server's config:

define service{ use local-service ; Name of service template to use host_name monitor1 service_description Root Partition check_command check_local_disk!20%!10%!/ }

It's attempting to do a local disk check on the nagios server itself. Not an NRPE check.

This is the command definition:

# 'check_local_disk' command definition define command{ command_name check_local_disk command_line $USER1$/check_disk -w $ARG1$ -c $ARG2$ -p $ARG3$ -x $ARG4$ }

Can someone please tel me where I'm going wrong?

Thanks, Tim