rootplotmpl: 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/rootplotmpl - from package: rootplot

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

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