I asked User:Alexander Misel to change the page model from wikitext to MassMessageList. When I was watching the history on my phone (see https://zh.m.wikipedia.org/wiki/Special:MobileDiff/52813452 ) and I got an internal error. {F27911698}
**Stacktrace**
```
Cannot diff content types other than MassMessageListContent
#0 /srv/mediawiki/php-1.33.0-wmf.12/includes/diff/DifferenceEngineSlotDiffRenderer.php(50): MediaWiki\MassMessage\MassMessageListDiffEngine->generateContentDiffBody(WikitextContent, MediaWiki\MassMessage\MassMessageListContent)
#1 /srv/mediawiki/php-1.33.0-wmf.12/includes/diff/DifferenceEngine.php(1058): DifferenceEngineSlotDiffRenderer->getDiff(WikitextContent, MediaWiki\MassMessage\MassMessageListContent)
#2 /srv/mediawiki/php-1.33.0-wmf.12/includes/diff/DifferenceEngine.php(976): DifferenceEngine->getDiffBody()
#3 /srv/mediawiki/php-1.33.0-wmf.12/includes/diff/DifferenceEngine.php(941): DifferenceEngine->getDiff(string, string, string)
#4 /srv/mediawiki/php-1.33.0-wmf.12/includes/diff/DifferenceEngine.php(709): DifferenceEngine->showDiff(string, string, string)
#5 /srv/mediawiki/php-1.33.0-wmf.12/extensions/MobileFrontend/includes/specials/SpecialMobileDiff.php(160): DifferenceEngine->showDiffPage()
#6 /srv/mediawiki/php-1.33.0-wmf.12/extensions/MobileFrontend/includes/specials/SpecialMobileDiff.php(132): SpecialMobileDiff->displayDiffPage()
#7 /srv/mediawiki/php-1.33.0-wmf.12/extensions/MobileFrontend/includes/specials/MobileSpecialPage.php(58): SpecialMobileDiff->executeWhenAvailable(string)
#8 /srv/mediawiki/php-1.33.0-wmf.12/includes/specialpage/SpecialPage.php(569): MobileSpecialPage->execute(string)
#9 /srv/mediawiki/php-1.33.0-wmf.12/includes/specialpage/SpecialPageFactory.php(558): SpecialPage->run(string)
#10 /srv/mediawiki/php-1.33.0-wmf.12/includes/MediaWiki.php(288): MediaWiki\Special\SpecialPageFactory->executePath(Title, RequestContext)
#11 /srv/mediawiki/php-1.33.0-wmf.12/includes/MediaWiki.php(862): MediaWiki->performRequest()
#12 /srv/mediawiki/php-1.33.0-wmf.12/includes/MediaWiki.php(517): MediaWiki->main()
#13 /srv/mediawiki/php-1.33.0-wmf.12/index.php(42): MediaWiki->run()
#14 /srv/mediawiki/w/index.php(3): include(string)
#15 {main}
```