missing iptables kernel modules
The package linux-rpi not contains modules xt_socket.ko,
nf_socket_ipv4.ko and nf_socket_ipv6.ko,
but they exists in the outdated package, release 3.7 and early.
(from redmine: issue id 10115, created on 2019-03-14)
To upload designs, you'll need to enable LFS and have admin enable hashed storage. More information