Theme throws error after update

Hi,

I took over a website that did not update the theme as of 2016. I now have update the theme but as a result I see multiple errors on the Homepage. See attached screenshot.


I deactivated all plugins and switched theme (to Twentytwenty two) and then the errors are gone.

So there is something in the theme that causes this. How can I solve this error?

Thank you for yuor help.


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