plaiter: 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/plaiter - from package: plait

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

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