where can i found process-host-perfdata-file?

[Arief Iqbal]

when i starting nagios, there's a warning:
 
 Nagios 2.5 starting... (PID=14518)
 Warning: Host performance file processing command 'process-host-perfdata-file' was not found - host performance data file will not be processed!
 Warning: Service performance file processing command 'process-service-perfdata-file' was not found - service performance data file will not be processed!
 
 any solution??
 
 thank you
 
 		
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