pypy-sandbox: 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/pypy-sandbox - from package: python-pypy.sandbox

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

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