Internal error
[6362009a11b7a2d50218dd03] /wiki/Newsletter:Administrators%27_newsletter MediaWiki\Exception\MWContentSerializationException: The Newsletter content is invalid.
Backtrace:
from /var/www/html/extensions/Newsletter/includes/Content/NewsletterContentHandler.php(71)
#0 /var/www/html/includes/Revision/RevisionStore.php(1239): MediaWiki\Extension\Newsletter\Content\NewsletterContentHandler->unserializeContent()
#1 /var/www/html/includes/Revision/RevisionStore.php(1519): MediaWiki\Revision\RevisionStore->loadSlotContent()
#2 /var/www/html/includes/Revision/SlotRecord.php(324): MediaWiki\Revision\RevisionStore->{closure:MediaWiki\Revision\RevisionStore::constructSlotRecords():1511}()
#3 /var/www/html/includes/Revision/RevisionRecord.php(221): MediaWiki\Revision\SlotRecord->getContent()
#4 /var/www/html/includes/Revision/RenderedRevision.php(230): MediaWiki\Revision\RevisionRecord->getContentOrThrow()
#5 /var/www/html/includes/Revision/RevisionRenderer.php(236): MediaWiki\Revision\RenderedRevision->getSlotParserOutput()
#6 /var/www/html/includes/Revision/RevisionRenderer.php(169): MediaWiki\Revision\RevisionRenderer->combineSlotOutput()
#7 /var/www/html/includes/Revision/RenderedRevision.php(196): MediaWiki\Revision\RevisionRenderer->{closure:MediaWiki\Revision\RevisionRenderer::getRenderedRevision():167}()
#8 /var/www/html/includes/poolcounter/PoolWorkArticleView.php(110): MediaWiki\Revision\RenderedRevision->getRevisionParserOutput()
#9 /var/www/html/includes/poolcounter/PoolWorkArticleView.php(81): MediaWiki\PoolCounter\PoolWorkArticleView->renderRevision()
#10 /var/www/html/includes/poolcounter/PoolCounterWork.php(173): MediaWiki\PoolCounter\PoolWorkArticleView->doWork()
#11 /var/www/html/includes/page/ParserOutputAccess.php(364): MediaWiki\PoolCounter\PoolCounterWork->execute()
#12 /var/www/html/includes/page/Article.php(834): MediaWiki\Page\ParserOutputAccess->getParserOutput()
#13 /var/www/html/includes/page/Article.php(551): MediaWiki\Page\Article->generateContentOutput()
#14 /var/www/html/includes/actions/ViewAction.php(80): MediaWiki\Page\Article->view()
#15 /var/www/html/includes/actions/ActionEntryPoint.php(728): MediaWiki\Actions\ViewAction->show()
#16 /var/www/html/includes/actions/ActionEntryPoint.php(505): MediaWiki\Actions\ActionEntryPoint->performAction()
#17 /var/www/html/includes/actions/ActionEntryPoint.php(143): MediaWiki\Actions\ActionEntryPoint->performRequest()
#18 /var/www/html/includes/MediaWikiEntryPoint.php(202): MediaWiki\Actions\ActionEntryPoint->execute()
#19 /var/www/html/index.php(58): MediaWiki\MediaWikiEntryPoint->run()
#20 {main}