era_check: 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:

/sbin/era_check - from package: device-mapper-persistent-data
/usr/sbin/era_check - from package: device-mapper-persistent-data

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

On Debian possible default full paths are:

/usr/sbin/era_check - from package: thin-provisioning-tools

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

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