Po instalaci WordPressu je požadováno přejít na vyšší verzi PHP – ale hlásí potom chyby

Dobrý den!

Po úspěšné instalaci WordPressu v. 6.7.2 bylo po mně vyžadováno zvýšení verze PHP 7.2. alespoň na verzi 7.4

Po změně na 7.4. se však při logování do administrace domény WordPressu objeví chyby:

„…

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…“

Přihlásit do domény se ovšem lze, ale na začátku se opět objeví 1 chyba:

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Souvisí to nějak s používanou šablonou? Mám použít nějakou jinou standardní? Rád bych se dostal i na některou z nejnovějších verzí PHP 8. Co i pro toto musím udělat?

Předem Vám velice moc děkuji za pomoc.

S pozdravem

M.O.