This warning (or error) is caused by outdated TYPO3 conditions in TypoScripts. In my case of TYPO3 11.5.30 it only was shown in the backend…
Schreib einen KommentarSchlagwort: typoscript
Old for a special page: Is now: For a set of pages: For a special language: More information: https://docs.typo3.org/m/typo3/reference-typoscript/master/en-us/Conditions/Index.html Author: Thomas Hezel, zazu.berlin 2020
Schreib einen Kommentar