autossh-argv0: 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/autossh-argv0 - from package: autossh

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

Error in other languages:
autossh-argv0: bevel nie gevind nie
autossh-argv0: comandă negăsită
autossh-argv0: comando não encontrado
autossh-argv0: commande introuvable
autossh-argv0: command not found
autossh-argv0: käsku ei ole
autossh-argv0: không tìm thấy lệnh
autossh-argv0: komanda nerasta
autossh-argv0: Kommando nicht gefunden.
autossh-argv0: kommandot finns inte
autossh-argv0: komut yok
autossh-argv0: nie znaleziono polecenia
autossh-argv0: níor aimsíodh an t-ordú
autossh-argv0: no se encontró la orden
autossh-argv0: no s'ha trobat l'ordre
autossh-argv0: opdracht niet gevonden
autossh-argv0: parancs nem található
autossh-argv0: perintah tidak ditemukan
autossh-argv0: príkaz nenájdený
autossh-argv0: příkaz nenalezen
autossh-argv0: команда не найдена
autossh-argv0: командата не е открита
autossh-argv0: 命令找不到
autossh-argv0: コマンドが見つかりません