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https://github.com/webdevops/TYPO3-metaseo/issues/377
https://github.com/TYPO3/Fluid/issues/8
https://forge.typo3.org/issues/79811
http://www.typo3forum.net/discussion/80593/fehlermeldung-bei-fluidviewhelper
https://www.typo3.net/forum/thematik/zeige/thema/127125/
http://typo3.3.n7.nabble.com/Probleme-im-Frontend-beim-Umstieg-auf-8-7-1-td288740.html
https://stackoverflow.com/questions/23871140/fluid-powered-typo3-the-right-settings-for-namespaces
https://usetypo3.com/24-fluid-tips.html
https://maischner.de/typo3-extbase-fluid-fehlermeldungen/
https://gitlab.libeo.com/publique/typo3/blob/master/8.4/vendor/typo3fluid/fluid/src/Core/Parser/TemplateProcessor/NamespaceDetectionTemplateProcessor.php