Debian: Vlan interface does not come up

I have a vlan configured for my network interface. Since last reboot this does not come up anymore and if I try to start it manually, it fails

sudo ifup eno1.4000RTNETLINK answers: File existsifup: failed to bring up eno1ifup: could not bring up parent interface eno1

My os is debian 10 and this is my config:

source /etc/network/interfaces.d/*auto loiface lo inet loopbackiface lo inet6 loopbackauto eno1iface eno1 inet static  address xxx.xxx.xxx.xxx  netmask 255.255.255.224  gateway xxx.xxx.xxx.xxx  up route add -net xxx.xxx.xxx netmask 255.255.255.224 gw xxx.xxx.xxx.xxx dev eno1iface eno1 inet6 static  address xxxx:xxxx:xxxx:xxxx::x  netmask 64  gateway fe80::1auto eno1.4000iface eno1.4000 inet static  address 192.168.100.4  netmask 255.255.255.0  vlan-raw-device eno1  mtu 1400a

bootlog shows

Aug 19 17:08:50 xxxx ifup[820]: ifup: failed to bring up eno1Aug 19 17:08:50 xxxx ifup[820]: RTNETLINK answers: File existsAug 19 17:08:50 xxxx ifup[820]: ifup: failed to bring up eno1Aug 19 17:08:50 xxxx ifup[820]: ifup: could not bring up parent interface eno1