Drupal don't find the contributed themes folder

Hello
I've made a Drupal site on my computer and copy it on my server (copying the File and Database) Every thing work well but the contributed themes.
With the base theme, Drupal work well, but when I try to change for The Zen (or Omega) theme it seem that the theme engine don't found the theme, every block is print as a text

User Bar First

This is a debugging block

User Bar Second

This is a debugging block

Savage Nephilim

Branding

This is a debugging block

Main menuHome Secondary menuMy accountLog out
Menu

This is a debugging block

Header First

This is a debugging block

Header Second

This is a debugging block

What did I have to change to fixe that ?

My Site : moxsoft.hd.free.fr/SavageNeph

Tks
guillaume