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<b>Warning</b>:  call_user_func_array() expects parameter 1 to be a valid callback, function '_wp_register_default_icon_collections' not found or invalid function name in <b>/home/mariange/public_html/wp-includes/class-wp-hook.php</b> on line <b>353</b><br />
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<b>Warning</b>:  call_user_func_array() expects parameter 1 to be a valid callback, function 'wp_schedule_personal_data_cleanup_requests' not found or invalid function name in <b>/home/mariange/public_html/wp-includes/class-wp-hook.php</b> on line <b>353</b><br />
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<b>Warning</b>:  call_user_func_array() expects parameter 1 to be a valid callback, function '_wp_register_default_icons' not found or invalid function name in <b>/home/mariange/public_html/wp-includes/class-wp-hook.php</b> on line <b>353</b><br />
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<b>Fatal error</b>:  Uncaught Error: Call to undefined function is_sitemap() in /home/mariange/public_html/wp-includes/class-wp.php:751
Stack trace:
#0 /home/mariange/public_html/wp-includes/class-wp.php(826): WP-&gt;handle_404()
#1 /home/mariange/public_html/wp-includes/functions.php(1343): WP-&gt;main('')
#2 /home/mariange/public_html/wp-blog-header.php(16): wp()
#3 /home/mariange/public_html/index.php(17): require('/home/mariange/...')
#4 {main}
  thrown in <b>/home/mariange/public_html/wp-includes/class-wp.php</b> on line <b>751</b><br />