yodl2html: 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/yodl2html - from package: yodl

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

Error in other languages:
yodl2html: bevel nie gevind nie
yodl2html: comandă negăsită
yodl2html: comando não encontrado
yodl2html: commande introuvable
yodl2html: command not found
yodl2html: käsku ei ole
yodl2html: không tìm thấy lệnh
yodl2html: komanda nerasta
yodl2html: Kommando nicht gefunden.
yodl2html: kommandot finns inte
yodl2html: komut yok
yodl2html: nie znaleziono polecenia
yodl2html: níor aimsíodh an t-ordú
yodl2html: no se encontró la orden
yodl2html: no s'ha trobat l'ordre
yodl2html: opdracht niet gevonden
yodl2html: parancs nem található
yodl2html: perintah tidak ditemukan
yodl2html: príkaz nenájdený
yodl2html: příkaz nenalezen
yodl2html: команда не найдена
yodl2html: командата не е открита
yodl2html: 命令找不到
yodl2html: コマンドが見つかりません