Additional static route problem for 8132F

Hello,

I have a problem when adding static route into 8132f for allow OOB to access from another subnet

When I added to following static in in below and it got a error message.
---
console(config)#ip route 192.168.20.0 255.255.255.0 192.168.10.1

The specified Static Route Next Hop Router Address can't be in the same subnet as the service/network port.
--


Following is part of my config for reference.

===
interface out-of-band
ip address 192.168.10.210 255.255.255.0 192.168.10.1
no ip redirects
ip routing
no ip icmp echo-reply
ip default-gateway 172.16.0.5
ip route 0.0.0.0 0.0.0.0 172.16.0.5 253

===

Where 192.168.10.1 is my internal firewall and 192.168.20.0/24 is another internal. 172.16.0.5 is external firewall.  

Thanks in advance.