Inconsistent address and mask

MaxRobinson

I'm attempting to set up static routes in my network on packet tracer and they all seem to work except routing to one specific router.
Network: 192.168.1.0
Mask: 255.255.254.0
Next Hop: 192.168.4.129 (Port on router)
There are 350 hosts on the 192.168.1.0 network and I used a /23 as part of VLSM
Why is this mask not consistent with address?
Thanks

DCD

That outside of the IP scope of the subnet. /23 is 512 address.