pdf-slices: 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 Debian possible default full paths are:

/usr/bin/pdf-slices - from package: slic3r

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

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