dpkg_resource: 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/lib/2013.com.canonical.certification:plainbox-resources/bin/dpkg_resource - from package: plainbox-provider-resource-generic

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

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