admin_lib.pyc: 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 CentOS possible default full paths are:

/usr/lib/python2.6/site-packages/windmill/bin/admin_lib.pyc - from package: python-windmill

You may install the required package with command yum install {package}

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