sparse: 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/sparse - from package: sparse

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

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