erode: 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/lib/mrtrix/bin/erode - from package: mrtrix

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

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