freefoam-wallHeatFlux: 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-wallHeatFlux - from package: freefoam

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

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