RTPredict: 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/RTPredict - from package: topp

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

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