qmidiarp: 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/qmidiarp - from package: qmidiarp

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

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