dcopquit: 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/dcopquit - from package: kdelibs3

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

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