Why do I get the following error?
Thanks a lot molot 

the problem was a wrong implementation to the views hooks as this post

and hook_views_query_alter

This hook should be placed in MODULENAME.views.inc and it will be auto-loaded. MODULENAME.views.inc must be in the directory specified by the 'path' key returned by MODULENAME_views_api(), or the same directory as the .module file, if 'path' is unspecified.