nl_BE: 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:

/var/spool/hylafax/bin/dict/nl_BE - from package: hylafax+

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

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