« MODx Parse Error »

MODx encountered the following error while attempting to parse the requested resource:
« Execution of a query to the database failed - Table './inndance_modx/modx_site_content' is marked as crashed and should be repaired »
      SQL: SELECT DISTINCT sc.id FROM `inndance_modx`.`modx_site_content` sc LEFT JOIN `inndance_modx`.`modx_document_groups` dg on dg.document = sc.id WHERE (sc.id IN (18) AND sc.published=1 AND sc.deleted=0 ) AND (sc.privateweb=0) GROUP BY sc.id ORDER BY sc.menuindex ASC
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Parser timing
  MySQL: 0.0035 s(1 Requests)
  PHP: 0.0325 s 
  Total: 0.0360 s