fwexec: 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/fwexec - from package: libnxt

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

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