freefoam-twoLiquidMixing: 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-twoLiquidMixing - from package: freefoam

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

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