Please Help!! error on verify main config file

[Arief Iqbal]

can somebody tell me why this is happen when i verifying the main configuration file with command: /usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg
 
 the error is like this:
 
 Nagios 2.5
 Copyright (c) 1999-2006 Ethan Galstad (http://www.nagios.org)
 Last Modified: 07-13-2006
 License: GPL
 
 Reading configuration data...
 
 Error: Command 'check_local_disk' has already been defined
 Error: Could not register command (config file '/usr/local/nagios/etc/minimal.cfg', starting on line 92)
 
 ***> One or more problems was encountered while processing the config files...
 
      Check your configuration file(s) to ensure that they contain valid
      directives and data defintions.  If you are upgrading from a previous
      version of Nagios, you should be aware that some variables/definitions
      may have been removed or modified in this version.  Make sure to read
      the HTML documentation regarding the config files, as well as the
      'Whats New' section to find out what has changed.
 
 
 please help me, thanks
 
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