plparse: 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 CentOS possible default full paths are:

/usr/bin/plparse - from package: gnustep-base

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/bin/plparse - from package: gnustep-base-runtime

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

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