MarketModels: 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/MarketModels - from package: quantlib-examples

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

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