Custom command, works from command line, not from nagios?

[Mister IT Guru]

I run this command from the cli

[root at host ~]# /usr/lib/nagios/plugins/check_nrpe -H client.localdomain 
-c get_disk -a localhost C: 70,80

OK - C: 'Percentage Space Used' = 54; |'C'=54;70;80;

And I get the response above. I defined the command below,

define command{
         command_name    check_cdrive
         command_line    $USER1$/get_disk -a  $HOSTADDRESS$ C: 70,80
         }

and also this service,

define service{

     use        generic-service        ; Inherit default values from a 
template
     hostgroup_name        Windows_Servers
     service_description    C Drive Space
     check_command    check_cdrive
     }

And I get this response when nagios runs the checks.

Status Information:    (Return code of 127 is out of bounds - plugin may 
be missing)


The target client is a windows box, running nrpe_nt -

Any ideas, as to where I'm going wrong, are appreciated :)

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