gen-auth: 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/gen-auth - from package: sasl2-bin

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

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