dp@fw# delete policy
[edit]
dp@fw# set policy route src-route rule 1001 destination address '0.0.0.0/0'
[edit]
dp@fw# set policy route src-route rule 1001 set table '1'
[edit]
dp@fw# set policy route src-route rule 1001 source address '172.21.50.14'
[edit]
dp@fw# commit
[ policy route src-route ]
VyOS had an issue completing a command.

We are sorry that you encountered a problem while using VyOS.
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Report time:      2022-03-18 13:42:05
Image version:    VyOS 1.4-rolling-202203180317
Release train:    sagitta

Built by:         [email protected]
Built on:         Fri 18 Mar 2022 03:17 UTC
Build UUID:       2fefdd36-f460-4755-b9b6-b78746e6ed79
Build commit ID:  20fd8588efdc77

Architecture:     x86_64
Boot via:         installed image
System type:      bare metal

Hardware vendor:  Supermicro
Hardware model:   Super Server
Hardware S/N:     0123456789
Hardware UUID:    00000000-0000-0000-0000-0cc47a7c059a

Traceback (most recent call last):
  File "/usr/libexec/vyos/conf_mode/policy-route.py", line 257, in <module>
    generate(c)
  File "/usr/libexec/vyos/conf_mode/policy-route.py", line 204, in generate
    policy['cleanup_commands'] = cleanup_commands(policy)
  File "/usr/libexec/vyos/conf_mode/policy-route.py", line 181, in cleanup_commands
    json_str = cmd(f'nft -j list table {table}')
  File "/usr/lib/python3/dist-packages/vyos/util.py", line 161, in cmd
    raise OSError(code, feedback)
PermissionError: [Errno 1] failed to run command: nft -j list table ip mangle
returned:
exit code: 1

noteworthy:
cmd 'nft -j list table ip mangle'
returned (out):

returned (err):
Error: No such file or directory; did you mean table ‘mangle’ in family inet?
list table ip mangle
              ^^^^^^

[[policy route src-route]] failed
Commit failed