« MODx Parse Error »

MODx encountered the following error while attempting to parse the requested resource:
« Execution of a query to the database failed - Incorrect key file for table: 'sc'. Try to repair it »
      SQL: SELECT sc.* FROM `funcrest`.`funcrest_site_content` sc LEFT JOIN `funcrest`.`funcrest_document_groups` dg ON dg.document = sc.id WHERE sc.id = '794' AND (sc.privateweb=0) LIMIT 1;
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Parser timing
  MySQL: 0.0057 s(0 Requests)
  PHP: 0.0329 s 
  Total: 0.0386 s 
Error while inserting event log into database.