freefoam-buoyantSimpleRadiation: 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/freefoam-buoyantSimpleRadiation - from package: freefoam

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

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