Execution of a query to the database failed

My client is getting the following error on their site you can see it here: (http://www.changeforkids.org).

Does anyone know how I can begin to fix this?

MODx encountered the following error while attempting to parse the requested resource:
« Execution of a query to the database failed - Table ’./changefo_cfkmodx/modx_site_content’ is marked as crashed and should be repaired »
SQL: SELECT DISTINCT sc.id, sc.menutitle, sc.pagetitle, sc.introtext, sc.menuindex, sc.published, sc.hidemenu, sc.parent, sc.isfolder, sc.description, sc.alias, sc.longtitle, sc.type,if(sc.type=’reference’,sc.content,’’) as content, sc.template, sc.link_attributes FROM `changefo_cfkmodx`.`modx_site_content` sc LEFT JOIN `changefo_cfkmodx`.`modx_document_groups` dg ON dg.document = sc.id WHERE sc.published=1 AND sc.deleted=0 AND (sc.privateweb=0) AND sc.hidemenu=0 AND sc.id IN (55,56,73,86) GROUP BY sc.id ORDER BY sc.menuindex ASC ;

If you have access to PHPMyAdmin (or other access to your client’s database), you need to repair the table specified in the error. There is generally a link under the Operations tab in PHPMyAdmin after you select the table in question.

Looks like there may be an issue with the query as well since what you posted does not match what is in the parse error message.