Error :- The permissions on the external command file and/or directory may be incorrect

[nag ios]

Hi i got an error when i tried to enable notification for one of the service
as below

External Command Interface
Last Updated: Fri Sep 16 06:09:32 IST 2011
Nagios® Core™ 3.3.1 - www.nagios.org
Logged in as *nagiosadmin*


 Error: Could not open command file '/usr/local/nagios/var/rw/nagios.cmd'
for update!
The permissions on the external command file and/or directory may be
incorrect. Read the FAQs on how to setup proper permissions.
An error occurred while attempting to commit your command for processing.

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Can any help me in this thing ?
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