Why do i see "No kdump initial ramdisk found." during system boot up ?

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Issue

See "No kdump initial ramdisk found." during system boot up or start/restart kdump service

No kdump initial ramdisk found.                            [WARNING]
Rebuilding /boot/initrd-2.6.18-371.el5kdump.img

Environment

Red Hat Enterprise Linux 5
Red Hat Enterprise Linux 6

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