ReactiveNavigationDemo: 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/ReactiveNavigationDemo - from package: mrpt-apps

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

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