Joomla erreur #404 Catégorie introuvable dans la recherche | Joomla error 404 when searching expression

Hi,
This error heppens somtimes when trying to perform a search on a joomla website.
After following the possible ways of this error, and reading forums  i've discovered that the reason was:
(i didn't found it on forums)
Demos menus in the web site (Australian park .....)
Just remove them
Preform a rebuild
And it's ok