mp_plot: 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/mp_plot - from package: python-memprof

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

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