Can someone understand what is this error?

A fatal error has occured:

Database error: Failed to execute query: 'SELECT glinks_Links.ID FROM glinks_CatLinks,glinks_Links WHERE glinks_CatLinks.LinkID = glinks_Links.ID AND (glinks_CatLinks.CategoryID = '2') ORDER BY Title,isValidated DESC,ASC LIMIT 0, 25': You have an error in your SQL syntax near 'ASC LIMIT 0, 25' at line 1 at /var/apache/cgi-bin/Links/admin/Links/Browser.pm line 1782. Thanks