Title: Adding Thumbnails
Last modified: August 19, 2016

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# Adding Thumbnails

 *  [ricketts8](https://wordpress.org/support/users/ricketts8/)
 * (@ricketts8)
 * [14 years, 11 months ago](https://wordpress.org/support/topic/adding-thumbnails-2/)
 * Warning: Cannot modify header information – headers already sent by (output started
   at /home/content/t/h/a/thadsmith1/html/wp-content/themes/chronicles/functions.
   php:7) in /home/content/t/h/a/thadsmith1/html/wp-admin/theme-editor.php on line
   89
 * Whenever I add `add_theme_support( 'post-thumbnails' );` I get the above message.
   My theme is Chronicles and is quite old so maybe that’s the problem. I don’t 
   know. Any ideas?

Viewing 2 replies - 1 through 2 (of 2 total)

 *  [esmi](https://wordpress.org/support/users/esmi/)
 * (@esmi)
 * [14 years, 11 months ago](https://wordpress.org/support/topic/adding-thumbnails-2/#post-2039293)
 * [Solving “headers already sent” warnings](http://codex.wordpress.org/FAQ_Troubleshooting#How_do_I_solve_the_Headers_already_sent_warning_problem.3F)
 * Hint: Try looking in functions.php
 *  Thread Starter [ricketts8](https://wordpress.org/support/users/ricketts8/)
 * (@ricketts8)
 * [14 years, 11 months ago](https://wordpress.org/support/topic/adding-thumbnails-2/#post-2039577)
 * Understood. It’s the thumbnails code as indicated in the WordPress Codex and 
   taken straight from there.

Viewing 2 replies - 1 through 2 (of 2 total)

The topic ‘Adding Thumbnails’ is closed to new replies.

## Tags

 * [php](https://wordpress.org/support/topic-tag/php/)
 * [thumbnails](https://wordpress.org/support/topic-tag/thumbnails/)

 * In: [Fixing WordPress](https://wordpress.org/support/forum/how-to-and-troubleshooting/)
 * 2 replies
 * 2 participants
 * Last reply from: [ricketts8](https://wordpress.org/support/users/ricketts8/)
 * Last activity: [14 years, 11 months ago](https://wordpress.org/support/topic/adding-thumbnails-2/#post-2039577)
 * Status: not resolved

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