pdftoipe: command not found

Have You tried accessing the binary with the full path?

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 Debian possible default full paths are:

/usr/bin/pdftoipe - from package: pdftoipe

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