jtexexpand: 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 CentOS possible default full paths are:

/usr/bin/jtexexpand - from package: latex2html

You may install the required package with command yum install {package}

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