Wireguard VPN problem - setting interface address without mask is no longer supported

[meaw229a]

On my FreeBSD desktop computer I'm using a commercial vpn server via wireguard for years without any problem.
Unfortunately the vpn does not work anymore on FreeBSD 15. On FreeBSD 14.3 the vpn is still working fine.

At the time I want to create the wireguard connection I get the following error message:

Trying to create the wireguard interface...
[#] ifconfig wg create name pia
[#] wg setconf pia /dev/stdin
[#] ifconfig pia inet 10.237.2.137 alias
ifconfig: ERROR: setting interface address without mask is no longer supported.
[#] ifconfig pia destroy

Does someone know how I can fix this?

 

[T-Daemon]

E.g.:

[#] ifconfig pia inet 10.237.2.137/24 alias

ifconfig(8)

EXAMPLES
     Assign the IPv4 address 192.0.2.10, with a network mask of 255.255.255.0,
     to the interface em0:
           # ifconfig em0 inet 192.0.2.10 netmask 255.255.255.0

     Add the IPv4 address 192.0.2.45, with the CIDR network prefix /28, to the
     interface em0:
           # ifconfig em0 inet 192.0.2.45/28 alias