WritePlotcharData: 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/WritePlotcharData - from package: ncl

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

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