Problem in create or recover a key

[mrbooshehri]

Input command:

sentinelcli keys add \
    --home "${HOME}/.sentinelcli" \
    sentinel_key

Output:

Error: unexpected end of JSON input

also --recover flag is unknown

Input command:

sentinelcli --recover sentinel_key

Output:

Error: unknown flag: --recover

uname -a:

Linux arch 5.14.12-arch1-1 #1 SMP PREEMPT Wed, 13 Oct 2021 16:58:16 +0000 x86_64 GNU/Linux
```