dcopserver: 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/dcopserver - from package: kdelibs3

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

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