Title: Headers error
Last modified: July 27, 2021

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# Headers error

 *  [julia77](https://wordpress.org/support/users/julia77/)
 * (@julia77)
 * [4 years, 8 months ago](https://wordpress.org/support/topic/headers-error/)
 * Hello,
 * When removing WP default displaying ‘category’ term in urls (by adding %category%
   as base for categories in the optional section in dashboard), no pages/posts 
   are displayed (only archives pages), getting a 404 error.
 * When I remove the optional base category, all is displayed correctly.
 * Previously, a SEO plugin used to remove WP default term but that plugin had been
   removed. I´ve cleared WP and several browsers cache, not solving the issue (no
   cache on server side).
 * When removing default term (no pages/posts diplayed, only archives pages), WP
   Debug mode shows:
 * > Notice: Undefined property: wpdb::$dmtable in /home/rabbitr1/public_html/wp-
   > includes/wp-db.php on line 648
   > Warning: Cannot modify header information – headers already sent by (output
   > started at /home/rabbitr1/public_html/wp-includes/wp-db.php:648) in /home/rabbitr1/
   > public_html/wp-content/plugins/wp-super-cache/wp-cache-phase2.php on line 1379
 * wp-cache-phase2.php on line 1379 says:
 * > if ( defined( ‘WPSC_VARY_HEADER’ ) ) {
   >  if ( WPSC_VARY_HEADER != ” ) { header(‘
   > Vary: ‘ . WPSC_VARY_HEADER ); }
 * Currently usign:
 * – WP v5.7.2
    – the latest Hello Elementor´s theme version – Elementor v3.2.5 –
   WP Super Cache 1.7.4
 * Why is this term removal affecting only pages/posts headers, and not those for
   archives?
 * Regards,
 * Julia
 * The page I need help with: _[[log in](https://login.wordpress.org/?redirect_to=https%3A%2F%2Fwordpress.org%2Fsupport%2Ftopic%2Fheaders-error%2F%3Foutput_format%3Dmd&locale=en_US)
   to see the link]_

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## Tags

 * [headers](https://wordpress.org/support/topic-tag/headers/)
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 * 0 replies
 * 1 participant
 * Last reply from: [julia77](https://wordpress.org/support/users/julia77/)
 * Last activity: [4 years, 8 months ago](https://wordpress.org/support/topic/headers-error/)
 * Status: not resolved