rrddir2xml: 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/share/torrus/bin/rrddir2xml - from package: torrus-common

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

Error in other languages:
rrddir2xml: bevel nie gevind nie
rrddir2xml: comandă negăsită
rrddir2xml: comando não encontrado
rrddir2xml: commande introuvable
rrddir2xml: command not found
rrddir2xml: käsku ei ole
rrddir2xml: không tìm thấy lệnh
rrddir2xml: komanda nerasta
rrddir2xml: Kommando nicht gefunden.
rrddir2xml: kommandot finns inte
rrddir2xml: komut yok
rrddir2xml: nie znaleziono polecenia
rrddir2xml: níor aimsíodh an t-ordú
rrddir2xml: no se encontró la orden
rrddir2xml: no s'ha trobat l'ordre
rrddir2xml: opdracht niet gevonden
rrddir2xml: parancs nem található
rrddir2xml: perintah tidak ditemukan
rrddir2xml: príkaz nenájdený
rrddir2xml: příkaz nenalezen
rrddir2xml: команда не найдена
rrddir2xml: командата не е открита
rrddir2xml: 命令找不到
rrddir2xml: コマンドが見つかりません