Try waiting a few minutes and reloading.
(Cannot access the database)
Backtrace:
#0 /home/spaceengineers/public_html/includes/libs/rdbms/loadbalancer/LoadBalancer.php(897): Database->reportConnectionError('Unknown error (...') #1 /home/spaceengineers/public_html/includes/libs/rdbms/loadbalancer/LoadBalancer.php(572): LoadBalancer->reportConnectionError() #2 /home/spaceengineers/public_html/extensions/SemanticMediaWiki/src/MediaWiki/LazyDBConnectionProvider.php(61): LoadBalancer->getConnection(-1, Array, false) #3 /home/spaceengineers/public_html/extensions/SemanticMediaWiki/src/MediaWiki/Database.php(484): SMW\MediaWiki\LazyDBConnectionProvider->getConnection() #4 /home/spaceengineers/public_html/extensions/SemanticMediaWiki/src/MediaWiki/Database.php(62): SMW\MediaWiki\Database->readConnection() #5 /home/spaceengineers/public_html/extensions/SemanticMediaWiki/src/MediaWiki/Database.php(85): SMW\MediaWiki\Database->getType() #6 /home/spaceengineers/public_html/extensions/SemanticMediaWiki/includes/storage/SQLStore/SMW_SQLStore3_Readers.php(300): SMW\MediaWiki\Database->tableName('smw_fpt_pval') #7 /home/spaceengineers/public_html/extensions/SemanticMediaWiki/includes/storage/SQLStore/SMW_SQLStore3_Readers.php(170): SMWSQLStore3Readers->fetchSemanticData(29, Object(SMW\DIWikiPage), Object(SMW\SQLStore\TableDefinition)) #8 /home/spaceengineers/public_html/extensions/SemanticMediaWiki/includes/storage/SQLStore/SMW_SQLStore3_Readers.php(214): SMWSQLStore3Readers->getSemanticDataFromTable(29, Object(SMW\DIWikiPage), Object(SMW\SQLStore\TableDefinition)) #9 /home/spaceengineers/public_html/extensions/SemanticMediaWiki/src/SQLStore/Lookup/CachedValueLookupStore.php(227): SMWSQLStore3Readers->getPropertyValues(Object(SMW\DIWikiPage), Object(SMW\DIProperty), NULL) #10 /home/spaceengineers/public_html/extensions/SemanticMediaWiki/includes/storage/SQLStore/SMW_SQLStore3.php(262): SMW\SQLStore\Lookup\CachedValueLookupStore->getPropertyValues(Object(SMW\DIWikiPage), Object(SMW\DIProperty), NULL) #11 /home/spaceengineers/public_html/extensions/SemanticMediaWiki/includes/datavalues/SMW_DataValue.php(801): SMWSQLStore3->getPropertyValues(Object(SMW\DIWikiPage), Object(SMW\DIProperty)) #12 /home/spaceengineers/public_html/extensions/SemanticMediaWiki/includes/datavalues/SMW_DataValue.php(191): SMWDataValue->checkAllowedValues() #13 /home/spaceengineers/public_html/extensions/SemanticMediaWiki/src/DataValueFactory.php(97): SMWDataValue->setUserValue('17 July 2023 13...', false) #14 /home/spaceengineers/public_html/extensions/SemanticMediaWiki/src/DataValueFactory.php(146): SMW\DataValueFactory::newTypeIdValue('_dat', '17 July 2023 13...', false, Object(SMW\DIProperty), NULL) #15 /home/spaceengineers/public_html/extensions/SemanticMediaWiki/src/MediaWiki/Specials/SearchByProperty/PageRequestOptions.php(108): SMW\DataValueFactory::newPropertyObjectValue(Object(SMW\DIProperty), '17 July 2023 13...') #16 /home/spaceengineers/public_html/extensions/SemanticMediaWiki/src/MediaWiki/Specials/SearchByProperty/PageBuilder.php(70): SMW\MediaWiki\Specials\SearchByProperty\PageRequestOptions->initialize() #17 /home/spaceengineers/public_html/extensions/SemanticMediaWiki/src/MediaWiki/Specials/SpecialSearchByProperty.php(72): SMW\MediaWiki\Specials\SearchByProperty\PageBuilder->getHtml() #18 /home/spaceengineers/public_html/includes/specialpage/SpecialPage.php(522): SMW\MediaWiki\Specials\SpecialSearchByProperty->execute('Modification-20...') #19 /home/spaceengineers/public_html/includes/specialpage/SpecialPageFactory.php(576): SpecialPage->run('Modification-20...') #20 /home/spaceengineers/public_html/includes/MediaWiki.php(283): SpecialPageFactory::executePath(Object(Title), Object(RequestContext)) #21 /home/spaceengineers/public_html/includes/MediaWiki.php(851): MediaWiki->performRequest() #22 /home/spaceengineers/public_html/includes/MediaWiki.php(512): MediaWiki->main() #23 /home/spaceengineers/public_html/index.php(43): MediaWiki->run() #24 {main}