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Dear Wp.
I built a website six years ago, windowszervizgyor.hu, and now I wanted to update the new template offered by WP, and my page is completely gone, I don’t even see the adim interface: Fatal error: Call to undefined function get_parent_theme_file_path () in / home / window /web/wp-content/themes/new-york-business/functions.php on line 67
What could have happened?