Βασίλης Παπακωνσταντίνου,

sql error:
SELECT BibTitlesPersons.TitlesID AS TitleID, BibTitlesPersons.TitlesID AS STitleID, BibTitlesPersons.PersonsID AS PersonID, BibTitlesPersons.PersonsKindID AS PersonKindID, BibTitles.Title AS BTitle, BibTitles.SubTitle AS BSubTitle, BibTitles.Writer AS BWriter, BibTitles.Publisher AS BPublisher, BibTitles.PubYear AS BPubYear, BibTitles.HasSmCov AS BHasSmCov, BibTitles.HasBigCov AS BHasBigCov, BibTitles.CoverImage AS BCoverImage, BibPerKind.PersonsKind1 AS PersonKind, BibPerKind.PersonsKind1eng AS PersonKindEng, BibPersons.Name AS PersonName, BibPersons.NameENG AS PersonNameEng, BibPersons.Website AS PersonWebsite, BibPersons.HasPhoto AS PersonHasPhoto, BibPersons.Photo AS PersonPhoto FROM BibTitlesPersons LEFT JOIN BibTitles ON BibTitles.TitlesID=BibTitlesPersons.TitlesID LEFT JOIN BibPerKind ON BibPerKind.PersonsKindID=BibTitlesPersons.PersonsKindID LEFT JOIN BibPersons ON BibPersons.PersonsID=BibTitlesPersons.PersonsID WHERE BibTitlesPersons.TitlesID IN () ORDER BY BibTitlesPersons.TitlesID

You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ') ORDER BY BibTitlesPersons.TitlesID' at line 1