Router not support and can't connect to the Home network

Hello, I bought 2 Yeelight LED color blubs which do not have any problem connected at my office. However, I tried to connect it at home with MiHome app, my router info is dim and error message "Public network aren’t support, connect to your home network.

My home network is using “Buffalo Airstation G300N router”
Using WEP encryption.

Please shed some light if we have to set anything in my router setting?

Many thanks,

Could you change to WPA/WPA2 and make sure your password is not empty?