pline: 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/pline - from package: libxgks-dev

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