acr: 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/acr - from package: acr

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

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