GenVtf: 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/GenVtf - from package: edk2-tools

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

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