EDIT:
I have this error from error.log:
[Wed Nov 25 09:19:35.190856 2020] [php7:error] [pid 18460:tid 1848] [client ::1:62743] PHP Fatal error: Uncaught Error: Class 'td_util' not found in C:\\xamppx\\htdocs\\d-stage\\wp-content\\themes\\Newsmag\\functions.php:52\nStack trace:\n#0 C:\\xamppx\\htdocs\\d-stage\\wp-includes\\class-wp-hook.php(287): {closure}(false, Object(WP_Query))\n#1 C:\\xamppx\\htdocs\\d-stage\\wp-includes\\plugin.php(206): WP_Hook->apply_filters(false, Array)\n#2 C:\\xamppx\\htdocs\\d-stage\\wp-includes\\class-wp.php(658): apply_filters('pre_handle_404', false, Object(WP_Query))\n#3 C:\\xamppx\\htdocs\\d-stage\\wp-includes\\class-wp.php(748): WP->handle_404()\n#4 C:\\xamppx\\htdocs\\d-stage\\wp-includes\\functions.php(1285): WP->main('')\n#5 C:\\xamppx\\htdocs\\d-stage\\wp-blog-header.php(16): wp()\n#6 C:\\xamppx\\htdocs\\d-stage\\index.php(17): require('C:\\\\xamppx\\\\htdoc...')\n#7 {main}\n thrown in C:\\xamppx\\htdocs\\d-stage\\wp-content\\themes\\Newsmag\\functions.php on line 52
