Warning: [mysql error 145] Table './gallery/piwigo_sessions' is marked as crashed and should be repaired

SELECT data
  FROM piwigo_sessions
  WHERE id = '266Bo2t9s7e286diga3nrhtlcond246rtro7'
; in /Library/WebServer/Documents/main/gallery/include/dblayer/functions_mysql.inc.php on line 654

Warning: [mysql error 145] Table './gallery/piwigo_images' is marked as crashed and should be repaired

SELECT id, path, tn_ext, level
  FROM piwigo_images
  WHERE id IN (12,26,90,109)
; in /Library/WebServer/Documents/main/gallery/include/dblayer/functions_mysql.inc.php on line 654

Warning: [mysql error 145] Table './gallery/piwigo_sessions' is marked as crashed and should be repaired

REPLACE INTO piwigo_sessions
  (id,data,expiration)
  VALUES('266Bo2t9s7e286diga3nrhtlcond246rtro7','',now())
; in /Library/WebServer/Documents/main/gallery/include/dblayer/functions_mysql.inc.php on line 654