A Database Error Occurred

Error Number: 1191

Can't find FULLTEXT index matching the column list

(SELECT *,MATCH(title,tag) AGAINST('Sohne Di Pasand , love, Donut Music')+1 as score FROM `full_screen_videostatus` where id <> 16931 AND status='show' AND action='approved' AND language like '%punjabi%')UNION(SELECT *,MATCH(title,tag) AGAINST('Sohne Di Pasand , love, Donut Music')+1 as score FROM `video_status` where status='show' AND action='approved' AND language like '%punjabi%')ORDER BY score DESC LIMIT 0,20

Filename: models/Video_view_m.php

Line Number: 45