narcissus.app-serve: 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 CentOS possible default full paths are:

/usr/bin/narcissus.app-serve - from package: python-narcissus-app

You may install the required package with command yum install {package}

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