ProofreadPage\Page\PageDifferenceEngine: could not maintain backwards compatibility. Please use a SlotDiffRenderer.

#0 /srv/mediawiki/php-1.33.0-wmf.1/extensions/ProofreadPage/includes/Page/PageDifferenceEngine.php(86): DifferenceEngine->generateContentDiffBody(WikitextContent, WikitextContent)
#1 /srv/mediawiki/php-1.33.0-wmf.1/extensions/ProofreadPage/includes/Page/PageDifferenceEngine.php(45): ProofreadPage\Page\PageDifferenceEngine->createTextDiffOutput(WikitextContent, WikitextContent, string)
#2 /srv/mediawiki/php-1.33.0-wmf.1/includes/diff/DifferenceEngineSlotDiffRenderer.php(50): ProofreadPage\Page\PageDifferenceEngine->generateContentDiffBody(ProofreadPage\Page\PageContent, ProofreadPage\Page\PageContent)
#3 /srv/mediawiki/php-1.33.0-wmf.1/includes/diff/DifferenceEngine.php(1056): DifferenceEngineSlotDiffRenderer->getDiff(ProofreadPage\Page\PageContent, ProofreadPage\Page\PageContent)
#4 /srv/mediawiki/php-1.33.0-wmf.1/includes/diff/DifferenceEngine.php(974): DifferenceEngine->getDiffBody()
#5 /srv/mediawiki/php-1.33.0-wmf.1/includes/diff/DifferenceEngine.php(939): DifferenceEngine->getDiff(string, string, string)
#6 /srv/mediawiki/php-1.33.0-wmf.1/includes/diff/DifferenceEngine.php(707): DifferenceEngine->showDiff(string, string, string)
#7 /srv/mediawiki/php-1.33.0-wmf.1/extensions/MobileFrontend/includes/specials/SpecialMobileDiff.php(160): DifferenceEngine->showDiffPage()
#8 /srv/mediawiki/php-1.33.0-wmf.1/extensions/MobileFrontend/includes/specials/SpecialMobileDiff.php(132): SpecialMobileDiff->displayDiffPage()
#9 /srv/mediawiki/php-1.33.0-wmf.1/extensions/MobileFrontend/includes/specials/MobileSpecialPage.php(58): SpecialMobileDiff->executeWhenAvailable(string)
#10 /srv/mediawiki/php-1.33.0-wmf.1/includes/specialpage/SpecialPage.php(569): MobileSpecialPage->execute(string)
#11 /srv/mediawiki/php-1.33.0-wmf.1/includes/specialpage/SpecialPageFactory.php(568): SpecialPage->run(string)
#12 /srv/mediawiki/php-1.33.0-wmf.1/includes/MediaWiki.php(288): MediaWiki\Special\SpecialPageFactory->executePath(Title, RequestContext)
#13 /srv/mediawiki/php-1.33.0-wmf.1/includes/MediaWiki.php(860): MediaWiki->performRequest()
#14 /srv/mediawiki/php-1.33.0-wmf.1/includes/MediaWiki.php(517): MediaWiki->main()
#15 /srv/mediawiki/php-1.33.0-wmf.1/index.php(42): MediaWiki->run()
#16 /srv/mediawiki/w/index.php(3): include(string)
#17 {main}