screenlets: 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/screenlets - from package: screenlets

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

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