extract_dca: 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/bin/extract_dca - from package: libdca-utils

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

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