message: You have installed version 1.20.27. Update to version 4.2.7.? Error

Hi,
I get the message
You have installed version 1.20.27. Update to version 4.2.7.
When I run this I no longer get the whole page.
Don’t just have the problem on one side.

Error Code:
==============
Ein Fehler vom Typ E_COMPILE_ERROR wurde in der Zeile 46 der Datei wp-content/themes/appthemes-vantage/includes/core/class-listing-dependencies.php verursacht. Fehlermeldung: Declaration of APP_Listing_Dependencies::do_item($handle) must be compatible with WP_Dependencies::do_item($handle, $group = false)

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