To reproduce, add network without prefix:
vyos@r11-roll# set container network NET03 [edit] vyos@r11-roll# commit [ container ] VyOS had an issue completing a command. Report time: 2021-11-09 18:39:28 Image version: VyOS 1.4-rolling-202111090317 Release train: sagitta Built by: [email protected] Built on: Tue 09 Nov 2021 03:17 UTC Build UUID: 65b8318e-dbe2-4856-a090-cefd6713891d Build commit ID: ee81272116cd68 Architecture: x86_64 Boot via: installed image System type: KVM guest Hardware vendor: QEMU Hardware model: Standard PC (Q35 + ICH9, 2009) Hardware S/N: Hardware UUID: 8e21d64e-e498-475c-9866-290cd53a3b86 Traceback (most recent call last): File "/usr/libexec/vyos/conf_mode/containers.py", line 325, in <module> verify(c) File "/usr/libexec/vyos/conf_mode/containers.py", line 161, in verify raise ConfigError(f'prefix for network "{net}" must be defined!') NameError: name 'net' is not defined [[container]] failed Commit failed [edit] vyos@r11-roll#