mzpp: 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/mzpp - from package: racket

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

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