Hi, I need some help

I would like to block incoming traffic from a specific ip on a specific port
This is what I have
source:
interface: wan
ip address range: 5.xxx.xxx.226 - second one is empty (valid ip instead of x's)
protocol: tcp
dest:
interface: lan
ip address range: both fields empty
port range: 139 - empty field
ON and DENY
box is ticked
name field has some text in it
I click save and get this pop-up:
Incorrect source ip address. Invalid format of the start IP address.
Current Firmware Version : 2.11
The ip is obviously valid, what should I do?