epstopdf: 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/epstopdf - from package: texlive-utils

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

On Debian possible default full paths are:

/usr/bin/epstopdf - from package: texlive-font-utils

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

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