base.pyc: 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"

On CentOS possible default full paths are:

/usr/lib/python2.6/site-packages/celery/bin/base.pyc - from package: python-celery

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