notification command errors

[Natalie Aloi]

I am getting this error: But I don't know where or how to define the service notification or host notification - any body know where to point me?

Checking contacts...
Error: Service notification command 'notify-by-email' specified for contact 'grover' is not defined anywhere!
Error: Host notification command 'host-notify-by-email' specified for contact 'grover' is not defined anywhere!
Error: Service notification command 'notify-by-email' specified for contact 'nagiosadmin' is not defined anywhere!
Error: Host notification command 'host-notify-by-email' specified for contact 'nagiosadmin' is not defined anywhere!
Error: Service notification command 'notify-by-email' specified for contact 'nats_cell' is not defined anywhere!
Error: Host notification command 'host-notify-by-email' specified for contact 'nats_cell' is not defined anywhere!

Network Operations Center Manager 
Experis Data Center LLC 
8209 Valley Pike 
PO Box 535 
Middletown,VA 22645 
phone:540-869-8702 
cell:240-988-3267 
fax:540-869-8710 
e-mail:naloi at experisdatacenters.com
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