exprlp: 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/exprlp - from package: rlplot

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

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