Warning in visudo: Host_Alias referenced but not defined

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Issue

Copied the /etc/sudoers file from a RHEL 5.7 system to a new RHEL 5.8
The warning message visudo: Warning: Host_Alias HALIAS1 referenced but not defined is displayed when the command visudo runs

Environment

Red Hat Enterprise Linux 5.8
sudo-1.7.2p1-14.el5_8.3

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