pdftosrc: 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/pdftosrc - from package: texlive

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

On Debian possible default full paths are:

/usr/bin/pdftosrc - from package: texlive-binaries

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

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