pamtohtmltbl: command not found

Have You tried accessing the binary with the full path?

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/pamtohtmltbl - from package: netpbm-progs

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