validate-storage-schemas: 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/validate-storage-schemas - from package: python-carbon

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

On Debian possible default full paths are:

/usr/bin/validate-storage-schemas - from package: graphite-carbon

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

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