guessit: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On Debian possible default full paths are:

/usr/bin/guessit - from package: python3-guessit

You may install the required package with command apt-get install {package}

Error in other languages:
guessit: bevel nie gevind nie
guessit: comandă negăsită
guessit: comando não encontrado
guessit: commande introuvable
guessit: command not found
guessit: käsku ei ole
guessit: không tìm thấy lệnh
guessit: komanda nerasta
guessit: Kommando nicht gefunden.
guessit: kommandot finns inte
guessit: komut yok
guessit: nie znaleziono polecenia
guessit: níor aimsíodh an t-ordú
guessit: no se encontró la orden
guessit: no s'ha trobat l'ordre
guessit: opdracht niet gevonden
guessit: parancs nem található
guessit: perintah tidak ditemukan
guessit: príkaz nenájdený
guessit: příkaz nenalezen
guessit: команда не найдена
guessit: командата не е открита
guessit: 命令找不到
guessit: コマンドが見つかりません