python2-jsondiff: 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/python2-jsondiff - from package: python-jsonpatch

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

Error in other languages:
python2-jsondiff: bevel nie gevind nie
python2-jsondiff: comandă negăsită
python2-jsondiff: comando não encontrado
python2-jsondiff: commande introuvable
python2-jsondiff: command not found
python2-jsondiff: käsku ei ole
python2-jsondiff: không tìm thấy lệnh
python2-jsondiff: komanda nerasta
python2-jsondiff: Kommando nicht gefunden.
python2-jsondiff: kommandot finns inte
python2-jsondiff: komut yok
python2-jsondiff: nie znaleziono polecenia
python2-jsondiff: níor aimsíodh an t-ordú
python2-jsondiff: no se encontró la orden
python2-jsondiff: no s'ha trobat l'ordre
python2-jsondiff: opdracht niet gevonden
python2-jsondiff: parancs nem található
python2-jsondiff: perintah tidak ditemukan
python2-jsondiff: príkaz nenájdený
python2-jsondiff: příkaz nenalezen
python2-jsondiff: команда не найдена
python2-jsondiff: командата не е открита
python2-jsondiff: 命令找不到
python2-jsondiff: コマンドが見つかりません