My service provider gave me a new set of static IPs. it's not giving me any error when I am putting it in the router static settings but after putting nothing happened. in my network its showing...

@woozle Yes you are right my subnet mask is 255.255.255.128 and ip is 172.20.186.109. but still it's showing that error.

My old TP link router work using the same static IP address. but when I am trying to connect my new router with the same static IP address given by the net provider its showing - default gateway does...