hexec: 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/hexec - from package: hexec

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

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