Problem after upgrade to 12.1: Ports Collection support for your FreeBSD version has ended,

[Edwin Ancaer]

Hello everybody,

I just upgraded to version 12.1, and now, when I try to install a package,
I always get the message: Ports Collection support for your FreeBSD version
has ended, and no ports are
guaranteed to build on this system. Please upgrade to a supported release.

I suppose the upgrade went well, because the uname -a command returns
FreeBSD ottopedi 12.1-RELEASE-p2 FreeBSD 12.1-RELEASE-p2 GENERIC  amd64

I freely admit I must have done something wrong, but I have no idea what.
Is there a way to get me out of this?

Thanks,

Edwin Ancaer
(maybe just not smart enoughto not use Windows)