vamp-simple-host: 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/vamp-simple-host - from package: vamp-plugin-sdk-devel

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

On Debian possible default full paths are:

/usr/bin/vamp-simple-host - from package: vamp-examples

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

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