It indicates that one of the interfaces configured with 192.168.x.x/X ip address is currently down. So when the device receives any packets destined to that interface ip, device will drop the packet and send destination network unreachable messages [meaning of reject] to the source system.
Thanks, Nellikka JNCIE x3 (SEC #321; SP #2839; ENT #790) Please Mark My Solution Accepted if it Helped, Kudos are Appreciated too!!!
Reject means that any packet matching that route will be dropped. One of the cases where I have seen this is when we configure proxy-arp. By any chance that address was configured under proxy-arp? if not, could you check where in your configuration is that address configured:
# show | display set | match [address]
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