watchmedo: 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/watchmedo - from package: python-watchdog

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

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