Database error: [Table 'ac_posts' is marked as crashed and should be repaired]

SELECT a.*, b.post_content FROM ac_posts a INNER JOIN ac_posts_content b ON a.ID = b.ID WHERE a.ID IN(247944,104027,104032,104034,123822,232205,477055,724638,790688,1129618,1151954,1739910,2187161,2942312,2964686,3701073,4449377,4786899,4832003,716475) ORDER BY FIELD(a.ID, 247944,104027,104032,104034,123822,232205,477055,724638,790688,1129618,1151954,1739910,2187161,2942312,2964686,3701073,4449377,4786899,4832003,716475);