GenCrc32: 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/GenCrc32 - from package: edk2-tools

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

Error in other languages:
GenCrc32: bevel nie gevind nie
GenCrc32: comandă negăsită
GenCrc32: comando não encontrado
GenCrc32: commande introuvable
GenCrc32: command not found
GenCrc32: käsku ei ole
GenCrc32: không tìm thấy lệnh
GenCrc32: komanda nerasta
GenCrc32: Kommando nicht gefunden.
GenCrc32: kommandot finns inte
GenCrc32: komut yok
GenCrc32: nie znaleziono polecenia
GenCrc32: níor aimsíodh an t-ordú
GenCrc32: no se encontró la orden
GenCrc32: no s'ha trobat l'ordre
GenCrc32: opdracht niet gevonden
GenCrc32: parancs nem található
GenCrc32: perintah tidak ditemukan
GenCrc32: príkaz nenájdený
GenCrc32: příkaz nenalezen
GenCrc32: команда не найдена
GenCrc32: командата не е открита
GenCrc32: 命令找不到
GenCrc32: コマンドが見つかりません