I'm getting these errors. I'm using the child theme, with the one page theme pre install. I can't seem to edit the footer and the widgets are giving me errors.
Can Someone help?
From WP version 5.8, the display and functionality of the Widgets changed.
That is why these errors may appear. However, the errors should be gone if you restore the previous Widgets settings with this plugin: https://wordpress.org/plugins/classic-widgets/.
But if you do not want to use this plugin, I recommend removing the widget from the error message and adding again.