dncopynodes: 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 Debian possible default full paths are:

/usr/sbin/dncopynodes - from package: dnet-progs

You may install the required package with command apt-get install {package}

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