kmdr-executor: 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/kmdr-executor - from package: kdewebdev

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

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