sync_to_snapshot: 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/sync_to_snapshot - from package: libvm-ec2-perl

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

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