rtdServer: 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/rtdServer - from package: skycat

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

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