dcop: 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/dcop - from package: kdelibs3

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

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