py_xls2html: 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/py_xls2html - from package: python-excelerator

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

Error in other languages:
py_xls2html: bevel nie gevind nie
py_xls2html: comandă negăsită
py_xls2html: comando não encontrado
py_xls2html: commande introuvable
py_xls2html: command not found
py_xls2html: käsku ei ole
py_xls2html: không tìm thấy lệnh
py_xls2html: komanda nerasta
py_xls2html: Kommando nicht gefunden.
py_xls2html: kommandot finns inte
py_xls2html: komut yok
py_xls2html: nie znaleziono polecenia
py_xls2html: níor aimsíodh an t-ordú
py_xls2html: no se encontró la orden
py_xls2html: no s'ha trobat l'ordre
py_xls2html: opdracht niet gevonden
py_xls2html: parancs nem található
py_xls2html: perintah tidak ditemukan
py_xls2html: príkaz nenájdený
py_xls2html: příkaz nenalezen
py_xls2html: команда не найдена
py_xls2html: командата не е открита
py_xls2html: 命令找不到
py_xls2html: コマンドが見つかりません