celerybeat.py: 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"

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