3rd generation Apple TV won’t connect to wifi. Error code -3905

I already changed my router setting from WPA/WPA2 to WPA2 - Personal. Mine is “WPA2 - Preshared Key” though. It allowed me to choose my netword and key in my password but I keep getting this message. I have already tried the turn off the apple tv, router and modem and turn on after 2-3 minutes. Still the same.

” There’s a problem with your network connection. Check your settings and try connecting again. (-3905)

Has anyone encountered this problem and found a solution? Pls, pls, help.