MediaWiki internal error.
Original exception: [aA4hYg1gBW7BhIlPxdA61gAAAIc] /wiki/Talk:K&R2_solutions:Chapter_1:Exercise_22 Wikimedia\Rdbms\DBQueryError: A database query error has occurred. Did you forget to run your application's database schema updater after upgrading or after adding a new extension?
Please see https://www.mediawiki.org/wiki/Special:MyLanguage/Manual:Upgrading and https://www.mediawiki.org/wiki/Special:MyLanguage/Manual:How_to_debug for more information.
Error 1146: Table 'clcwiki.l' doesn't exist
Function: Wikimedia\Rdbms\DBConnRef::query
Query:
SELECT page_namespace,
page_title
FROM l
INNER JOIN p
ON l.pl_from = p.page_id
WHERE page_title = 'K&R2_solutions:Chapter_1:Exercise_22' AND
pl_from_namespace = 1 AND
page_is_redirect = 1
Backtrace:
from /var/www/clc-wiki.net/mediawiki/includes/libs/rdbms/database/Database.php(1198)
#0 /var/www/clc-wiki.net/mediawiki/includes/libs/rdbms/database/Database.php(1182): Wikimedia\Rdbms\Database->getQueryException()
#1 /var/www/clc-wiki.net/mediawiki/includes/libs/rdbms/database/Database.php(1156): Wikimedia\Rdbms\Database->getQueryExceptionAndLog()
#2 /var/www/clc-wiki.net/mediawiki/includes/libs/rdbms/database/Database.php(647): Wikimedia\Rdbms\Database->reportQueryError()
#3 /var/www/clc-wiki.net/mediawiki/includes/libs/rdbms/database/DBConnRef.php(127): Wikimedia\Rdbms\Database->query()
#4 /var/www/clc-wiki.net/mediawiki/includes/libs/rdbms/database/DBConnRef.php(302): Wikimedia\Rdbms\DBConnRef->__call()
#5 /var/www/clc-wiki.net/mediawiki/extensions/Hierarchy/UtilityFunctions.php(39): Wikimedia\Rdbms\DBConnRef->query()
#6 /var/www/clc-wiki.net/mediawiki/skins/Treeview/Treeview.php(161): wfGetRedirectsTo()
#7 /var/www/clc-wiki.net/mediawiki/skins/Treeview/Treeview.php(592): SkinTreeview->outputPage_ex()
#8 /var/www/clc-wiki.net/mediawiki/includes/skins/SkinTemplate.php(161): TreeviewTemplate->execute()
#9 /var/www/clc-wiki.net/mediawiki/includes/skins/SkinTemplate.php(180): SkinTemplate->generateHTML()
#10 /var/www/clc-wiki.net/mediawiki/includes/skins/Skin.php(683): SkinTemplate->outputPage()
#11 /var/www/clc-wiki.net/mediawiki/includes/Output/OutputPage.php(3193): Skin->outputPageFinal()
#12 /var/www/clc-wiki.net/mediawiki/includes/actions/ActionEntryPoint.php(163): MediaWiki\Output\OutputPage->output()
#13 /var/www/clc-wiki.net/mediawiki/includes/MediaWikiEntryPoint.php(200): MediaWiki\Actions\ActionEntryPoint->execute()
#14 /var/www/clc-wiki.net/mediawiki/index.php(58): MediaWiki\MediaWikiEntryPoint->run()
#15 {main}
Exception caught inside exception handler: [aA4hYg1gBW7BhIlPxdA61gAAAIc] /wiki/Talk:K&R2_solutions:Chapter_1:Exercise_22 Wikimedia\Rdbms\DBQueryError: A database query error has occurred. Did you forget to run your application's database schema updater after upgrading or after adding a new extension?
Please see https://www.mediawiki.org/wiki/Special:MyLanguage/Manual:Upgrading and https://www.mediawiki.org/wiki/Special:MyLanguage/Manual:How_to_debug for more information.
Error 1146: Table 'clcwiki.l' doesn't exist
Function: Wikimedia\Rdbms\DBConnRef::query
Query:
SELECT page_namespace,
page_title
FROM l
INNER JOIN p
ON l.pl_from = p.page_id
WHERE page_title = 'K&R2_solutions:Chapter_1:Exercise_22' AND
pl_from_namespace = 1 AND
page_is_redirect = 1
Backtrace:
from /var/www/clc-wiki.net/mediawiki/includes/libs/rdbms/database/Database.php(1198)
#0 /var/www/clc-wiki.net/mediawiki/includes/libs/rdbms/database/Database.php(1182): Wikimedia\Rdbms\Database->getQueryException()
#1 /var/www/clc-wiki.net/mediawiki/includes/libs/rdbms/database/Database.php(1156): Wikimedia\Rdbms\Database->getQueryExceptionAndLog()
#2 /var/www/clc-wiki.net/mediawiki/includes/libs/rdbms/database/Database.php(647): Wikimedia\Rdbms\Database->reportQueryError()
#3 /var/www/clc-wiki.net/mediawiki/includes/libs/rdbms/database/DBConnRef.php(127): Wikimedia\Rdbms\Database->query()
#4 /var/www/clc-wiki.net/mediawiki/includes/libs/rdbms/database/DBConnRef.php(302): Wikimedia\Rdbms\DBConnRef->__call()
#5 /var/www/clc-wiki.net/mediawiki/extensions/Hierarchy/UtilityFunctions.php(39): Wikimedia\Rdbms\DBConnRef->query()
#6 /var/www/clc-wiki.net/mediawiki/skins/Treeview/Treeview.php(161): wfGetRedirectsTo()
#7 /var/www/clc-wiki.net/mediawiki/skins/Treeview/Treeview.php(592): SkinTreeview->outputPage_ex()
#8 /var/www/clc-wiki.net/mediawiki/includes/skins/SkinTemplate.php(161): TreeviewTemplate->execute()
#9 /var/www/clc-wiki.net/mediawiki/includes/skins/SkinTemplate.php(180): SkinTemplate->generateHTML()
#10 /var/www/clc-wiki.net/mediawiki/includes/skins/Skin.php(683): SkinTemplate->outputPage()
#11 /var/www/clc-wiki.net/mediawiki/includes/Output/OutputPage.php(3193): Skin->outputPageFinal()
#12 /var/www/clc-wiki.net/mediawiki/includes/exception/MWExceptionRenderer.php(190): MediaWiki\Output\OutputPage->output()
#13 /var/www/clc-wiki.net/mediawiki/includes/exception/MWExceptionRenderer.php(109): MWExceptionRenderer::reportHTML()
#14 /var/www/clc-wiki.net/mediawiki/includes/exception/MWExceptionHandler.php(135): MWExceptionRenderer::output()
#15 /var/www/clc-wiki.net/mediawiki/includes/exception/MWExceptionHandler.php(239): MWExceptionHandler::report()
#16 /var/www/clc-wiki.net/mediawiki/includes/MediaWikiEntryPoint.php(222): MWExceptionHandler::handleException()
#17 /var/www/clc-wiki.net/mediawiki/includes/actions/ActionEntryPoint.php(82): MediaWiki\MediaWikiEntryPoint->handleTopLevelError()
#18 /var/www/clc-wiki.net/mediawiki/includes/MediaWikiEntryPoint.php(206): MediaWiki\Actions\ActionEntryPoint->handleTopLevelError()
#19 /var/www/clc-wiki.net/mediawiki/index.php(58): MediaWiki\MediaWikiEntryPoint->run()
#20 {main}