jos-Warning: exception 'RuntimeException' with message 'Unknown column 'header'  

Buenas tardes, en mi página web cuando se accede a algún enlace inexistente en vez de aparecer el 404 aparece algo así:

jos-Warning: exception 'RuntimeException' with message 'Unknown column 'header' in 'field list' SQL=SELECT `new_url`,`header`,`published` FROM `#__redirect_links` WHERE `old_url` = 'http://nataliadepaola.com/dg' LIMIT 0, 1' in /home/nataliadepaola/public_html/libraries/joomla/database/driver/mysql.php:351 Stack trace: #0 /home/nataliadepaola/public_html/libraries/joomla/database/driver.php(1653): JDatabaseDriverMysql->execute() #1 /home/nataliadepaola/public_html/plugins/system/redirect/redirect.php(123): JDatabaseDriver->loadObject() #2 /home/nataliadepaola/public_html/plugins/system/redirect/redirect.php(57): PlgSystemRedirect::doErrorHandling(Object(JException)) #3 [internal function]: PlgSystemRedirect::handleError(Object(JException)) #4 /home/nataliadepaola/public_html/libraries/legacy/error/error.php(760): call_user_func(Array, Object(JException)) #5 [internal function]: JError::handleCallback(Object(JException), Array) #6 /home/nataliadepaola/public_html/libraries/legacy/error/error.php(218): call_user_func_array(Array, Array) #7 /home/nataliadepaola/public_html/libraries/legacy/error/error.php(179): JError::throwError(Object(JException)) #8 /home/nataliadepaola/public_html/libraries/legacy/error/error.php(254): JError::raise(1, 404, 'ArtxC3xADculo no en...', NULL, true) #9 /home/nataliadepaola/public_html/components/com_content/models/article.php(163): JError::raiseError(404, 'ArtxC3xADculo no en...') #10 /home/nataliadepaola/public_html/libraries/legacy/view/legacy.php(401): ContentModelArticle->getItem() #11 /home/nataliadepaola/public_html/components/com_content/views/article/view.html.php(42): JViewLegacy->get('Item') #12 /home/nataliadepaola/public_html/libraries/legacy/controller/legacy.php(690): ContentViewArticle->display() #13 /home/nataliadepaola/public_html/components/com_content/controller.php(113): JControllerLegacy->display(true, Array) #14 /home/nataliadepaola/public_html/libraries/legacy/controller/legacy.php(728): ContentController->display() #15 /home/nataliadepaola/public_html/components/com_content/content.php(38): JControllerLegacy->execute(NULL) #16 /home/nataliadepaola/public_html/libraries/cms/component/helper.php(405): require_once('/home/nataliade...') #17 /home/nataliadepaola/public_html/libraries/cms/component/helper.php(380): JComponentHelper::executeComponent('/home/nataliade...') #18 /home/nataliadepaola/public_html/libraries/cms/application/site.php(191): JComponentHelper::renderComponent('com_content') #19 /home/nataliadepaola/public_html/libraries/cms/application/site.php(230): JApplicationSite->dispatch() #20 /home/nataliadepaola/public_html/libraries/cms/application/cms.php(257): JApplicationSite->doExecute() #21 /home/nataliadepaola/public_html/index.php(49): JApplicationCms->execute() #22 {main}

¿cómo se puede arreglar? gracias

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