<div class="bs-exception">
  <h3>Es ist ein Fehler aufgetreten</h3>
  <p>Bei der Verarbeitung deiner Anfrage ist folgender Fehler aufgetreten:</p>
  <div class="bs-exception-message">
⧼A connection error occured. 
Query: SELECT  page_title,pp_propname  FROM `hw_page` LEFT JOIN `hw_page_props` ON (pp_propname = 'hiddencat' AND (pp_page = page_id))   WHERE (page_namespace = '14' AND page_title IN ('Think_tank','Neoliberale_Netzwerke','Energie','Klima','CDU','CSU','FDP','AfD','Wissenschaftslobbyismus') )  
Function: ApiParse::formatCategoryLinks
Error: 2006 MySQL server has gone away (127.0.0.1)
⧽
  </div>
  <p>Bitte kontaktieren Sie Ihren Administrator.</p>
  <hr />
  <span class="bs-exception-stacktrace-toggle">
    <span style="display:none;">Fehlerdetails anzeigen</span>
    <span style="display:none;">Fehlerdetails verbergen</span>
  </span>
  <div class="bs-exception-stacktrace">
   <pre>
#0 /var/www/bluespice/w/includes/libs/rdbms/database/Database.php(1427): Wikimedia\Rdbms\Database->makeQueryException('MySQL server ha...', 2006, 'SELECT  page_ti...', 'ApiParse::forma...')
#1 /var/www/bluespice/w/includes/libs/rdbms/database/Database.php(1200): Wikimedia\Rdbms\Database->reportQueryError('MySQL server ha...', 2006, 'SELECT  page_ti...', 'ApiParse::forma...', false)
#2 /var/www/bluespice/w/includes/libs/rdbms/database/Database.php(1653): Wikimedia\Rdbms\Database->query('SELECT  page_ti...', 'ApiParse::forma...')
#3 /var/www/bluespice/w/includes/api/ApiParse.php(688): Wikimedia\Rdbms\Database->select(Array, Array, '(page_namespace...', 'ApiParse::forma...', Array, Array)
#4 /var/www/bluespice/w/includes/api/ApiParse.php(371): ApiParse->formatCategoryLinks(Array)
#5 /var/www/bluespice/w/includes/api/ApiMain.php(1579): ApiParse->execute()
#6 /var/www/bluespice/w/includes/api/ApiMain.php(504): ApiMain->executeAction()
#7 /var/www/bluespice/w/extensions/BlueSpiceUEModulePDF/includes/PDFPageProvider.class.php(124): ApiMain->execute()
#8 /var/www/bluespice/w/extensions/BlueSpiceUEModulePDF/includes/PDFPageProvider.class.php(56): BsPDFPageProvider::collectData(Object(Title), Object(DOMDocument), Array)
#9 /var/www/bluespice/w/extensions/BlueSpiceUEModulePDFRecursive/UEModulePDFRecursive.class.php(166): BsPDFPageProvider::getPage(Array)
#10 /var/www/bluespice/w/includes/Hooks.php(177): UEModulePDFRecursive->onBSUEModulePDFBeforeAddingContent(Array, Array, Object(SpecialUniversalExport), Array)
#11 /var/www/bluespice/w/includes/Hooks.php(205): Hooks::callHook('BSUEModulePDFBe...', Array, Array, NULL)
#12 /var/www/bluespice/w/extensions/BlueSpiceUEModulePDF/includes/ExportModulePDF.class.php(98): Hooks::run('BSUEModulePDFBe...', Array)
#13 /var/www/bluespice/w/extensions/BlueSpiceUniversalExport/includes/specials/SpecialUniversalExport.class.php(191): BsExportModulePDF->createExportFile(Object(SpecialUniversalExport))
#14 /var/www/bluespice/w/extensions/BlueSpiceUniversalExport/includes/specials/SpecialUniversalExport.class.php(117): SpecialUniversalExport->processParameter('Stiftung_marktw...')
#15 /var/www/bluespice/w/includes/specialpage/SpecialPage.php(565): SpecialUniversalExport->execute('Stiftung_marktw...')
#16 /var/www/bluespice/w/includes/specialpage/SpecialPageFactory.php(568): SpecialPage->run('Stiftung_marktw...')
#17 /var/www/bluespice/w/includes/MediaWiki.php(288): SpecialPageFactory::executePath(Object(Title), Object(RequestContext))
#18 /var/www/bluespice/w/includes/MediaWiki.php(861): MediaWiki->performRequest()
#19 /var/www/bluespice/w/includes/MediaWiki.php(524): MediaWiki->main()
#20 /var/www/bluespice/w/index.php(42): MediaWiki->run()
#21 {main}
   </pre>
  </div>
</div>