Seit der Umstellung auf php 8 Fehlermeldungen

Hallo zusammen,

nun habe ich einige Tage gegoogelt, leider kein passendes Ergebnis gefunden.
Muss aber auch sagen, mein Englisch ist auch mehr als bescheiden.
Bei Ionos musste ich meine Webseite auf php 8 umstellen.
Nun bekomme ich für das Themes Twenty Eleven Version: 4.2 Fehlermeldungen.

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Für Hilfen wäre ich dankbar.
Gruß Stefan

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