celeryev.pyo: 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"

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