Nagios External commands problem: Could not stat command file

I have just installed nagios3 on ubuntu. I  have setup my  windows machine with nsclient++. I can see my machine's up on nagios (ping) but when i try to  schedule a check, i get the followinfg error:

Error: Could not stat() command file '/var/lib/nagios3/rw/nagios.cmd'!

I have  this file does not exist!

Any help is apreciated!
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koffuConnect With a Mentor Commented:
# grep -R 'nagios.cmd' /etc/nagios*
# ls -l /var/lib/nagios3/
total 1220
-rw-r--r-- 1 nagios nagios     15733 2009-03-11 12:31 nagios.debug
-rw-r--r-- 1 root   root         366 2010-08-19 12:37 nagios.log
-rw------- 1 nagios www-data 1213812 2010-11-30 14:36 retention.dat
drwx--s--- 2 nagios www-data    4096 2010-09-24 11:47 rw
drwxr-x--- 3 nagios nagios      4096 2009-03-10 12:05 spool

# ls -l /var/lib/nagios3/rw/
total 0
prw-rw---- 1 nagios www-data 0 2010-11-30 14:25 nagios.cmd

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be sure directory /var/lib/nagios3/rw exist and have valid permissions. If pipe does not exist, simple create it: mkpipe /var/lib/nagios3/rw/nagios.cmd ; chown nagios:www-data /var/lib/nagios3/rw/nagios.cmd ; chmod 660 /var/lib/nagios3/rw/nagios.cmd
Sanga CollinsSystems AdminCommented:
did you complete this step of the setup? it is supposed to configure nagios to allow running of external commands on other systems.

make install-commandmode
maxalarieAuthor Commented:
I  have used  ubuntu, i got nagios3 by goin: apt-get isntall nagios3 nagios3-plugins
i have also enabled the external_command in nagios.cfg file.
maxalarieAuthor Commented:
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