ae_diff2htm: 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/ae_diff2htm - from package: aegis-web

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

Error in other languages:
ae_diff2htm: bevel nie gevind nie
ae_diff2htm: comandă negăsită
ae_diff2htm: comando não encontrado
ae_diff2htm: commande introuvable
ae_diff2htm: command not found
ae_diff2htm: käsku ei ole
ae_diff2htm: không tìm thấy lệnh
ae_diff2htm: komanda nerasta
ae_diff2htm: Kommando nicht gefunden.
ae_diff2htm: kommandot finns inte
ae_diff2htm: komut yok
ae_diff2htm: nie znaleziono polecenia
ae_diff2htm: níor aimsíodh an t-ordú
ae_diff2htm: no se encontró la orden
ae_diff2htm: no s'ha trobat l'ordre
ae_diff2htm: opdracht niet gevonden
ae_diff2htm: parancs nem található
ae_diff2htm: perintah tidak ditemukan
ae_diff2htm: príkaz nenájdený
ae_diff2htm: příkaz nenalezen
ae_diff2htm: команда не найдена
ae_diff2htm: командата не е открита
ae_diff2htm: 命令找不到
ae_diff2htm: コマンドが見つかりません