TYPO3 Exception 1561583127¶
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TYPO3 10.4.28 - 2020-05-25¶
InvalidArgumentException: TypoScriptFrontendController must be constructed with a valid SiteLanguage object or a resolved site in the current request as fallback. None given.
Preview section of a flux content element used
<f:cObject> to access a TypoScript-defined function. Because no TSFE is available in the backend, one is created and that brings this error
Workaround: Do not use
<f:cObject> in backend previews.
In TYPO3v11 this has been fixed with https://forge.typo3.org/issues/91511, but that change has not been backported to v10.