dumphint: 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/dumphint - from package: ghostscript

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

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