#0 /opt/mediawiki/w/includes/api/ApiBase.php(1896): ApiUsageException::newWithMessage(Object(ApiParse), Array, NULL, NULL, NULL)
#1 /opt/mediawiki/w/includes/api/ApiBase.php(933): ApiBase->dieWithError(Array)
#2 /opt/mediawiki/w/includes/api/ApiParse.php(148): ApiBase->getTitleOrPageId(Array, 'fromdb')
#3 /opt/mediawiki/w/includes/api/ApiMain.php(1582): ApiParse->execute()
#4 /opt/mediawiki/w/includes/api/ApiMain.php(504): ApiMain->executeAction()
#5 /opt/mediawiki/w/extensions/BlueSpiceUEModulePDF/includes/PDFPageProvider.class.php(127): ApiMain->execute()
#6 /opt/mediawiki/w/extensions/BlueSpiceUEModulePDF/includes/PDFPageProvider.class.php(58): BsPDFPageProvider::collectData(Object(Title), Object(DOMDocument), Array)
#7 /opt/mediawiki/w/extensions/BlueSpiceUEModulePDFRecursive/UEModulePDFRecursive.class.php(176): BsPDFPageProvider::getPage(Array)
#8 /opt/mediawiki/w/includes/Hooks.php(177): UEModulePDFRecursive->onBSUEModulePDFBeforeAddingContent(Array, Array, Object(SpecialUniversalExport), Array)
#9 /opt/mediawiki/w/includes/Hooks.php(205): Hooks::callHook('BSUEModulePDFBe...', Array, Array, NULL)
#10 /opt/mediawiki/w/extensions/BlueSpiceUEModulePDF/includes/ExportModulePDF.class.php(98): Hooks::run('BSUEModulePDFBe...', Array)
#11 /opt/mediawiki/w/extensions/BlueSpiceUniversalExport/includes/specials/SpecialUniversalExport.class.php(191): BsExportModulePDF->createExportFile(Object(SpecialUniversalExport))
#12 /opt/mediawiki/w/extensions/BlueSpiceUniversalExport/includes/specials/SpecialUniversalExport.class.php(117): SpecialUniversalExport->processParameter('GDB')
#13 /opt/mediawiki/w/includes/specialpage/SpecialPage.php(565): SpecialUniversalExport->execute('GDB')
#14 /opt/mediawiki/w/includes/specialpage/SpecialPageFactory.php(568): SpecialPage->run('GDB')
#15 /opt/mediawiki/w/includes/MediaWiki.php(288): SpecialPageFactory::executePath(Object(Title), Object(RequestContext))
#16 /opt/mediawiki/w/includes/MediaWiki.php(818): MediaWiki->performRequest()
#17 /opt/mediawiki/w/includes/MediaWiki.php(524): MediaWiki->main()
#18 /opt/mediawiki/w/index.php(42): MediaWiki->run()
#19 {main}