I’m a little bit late to this thread, but this one is not gonna be fixed by automatic updates, because both of these issues were caused most probably by misunderstanding some settings.
The first error tells you that it couldn’t find value of network.lan.proto. In LuCI → Interfaces → LAN, you can choose one of protocol, which suits you better. By default, I think there’s static address.
The second one means that it cannot find the WAN interface. If you don’t use WAN interface, but you’re using WAN6 interface, you don’t need to delete it. Disabling WAN interface will do the same job. You can add the interface back in LuCI or you can add these rows to /etc/config/network
config interface 'wan'
option ifname 'wan'
option proto 'none'