HP v1910 RADIUS Setup

Hello,

I'm trying to setup RADIUS auth in a HP v1910-24G. I already updated the firmware to "5.20 Release 1516".

When I try to enter the shared RADIUS key, the switch tells me "Current IP has not be configured" and doesn't accept the key. What does that mean? Of course, my current IP has been configured. Which IP is it talking about?

Thanks for your held!