Error in Query

SQL: SELECT FName_de as FName, FFilename, FTExt FROM fvs_news_file INNER JOIN fvs_file ON PKFileNb = FKFileNb INNER JOIN fvs_filetype ON FKFiletypeNb = PKFiletypeNb WHERE FActive = 1 AND FKNewsNb = ORDER BY OrderNb

Error: 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 OrderNb' at line 1