Title: Debug errors: advanced-cache.php
Last modified: August 20, 2016

---

# Debug errors: advanced-cache.php

 *  [dbraphael](https://wordpress.org/support/users/dbraphael/)
 * (@dbraphael)
 * [13 years, 4 months ago](https://wordpress.org/support/topic/debug-errors-advanced-cachephp/)
 * I am trying to figure out why my wp site has become so slow recently. I turned
   on debugging and received the following errors:
 *     ```
       Notice: Undefined index: qcABC in /home/content/14/9074414/html/wp-content/advanced-cache.php on line 50
   
       Warning: Cannot modify header information - headers already sent by (output started at /home/content/14/9074414/html/wp-content/advanced-cache.php:50) in /home/content/14/9074414/html/wp-content/advanced-cache.php on line 52
   
       Warning: Cannot modify header information - headers already sent by (output started at /home/content/14/9074414/html/wp-content/advanced-cache.php:50) in /home/content/14/9074414/html/wp-content/advanced-cache.php on line 53
   
       Warning: Cannot modify header information - headers already sent by (output started at /home/content/14/9074414/html/wp-content/advanced-cache.php:50) in /home/content/14/9074414/html/wp-content/advanced-cache.php on line 54
   
       Warning: Cannot modify header information - headers already sent by (output started at /home/content/14/9074414/html/wp-content/advanced-cache.php:50) in /home/content/14/9074414/html/wp-content/advanced-cache.php on line 55
       ```
   
 * Might these errors be affecting my site? Should I be concerned?
 * Thanks.
 * Diyg

Viewing 4 replies - 1 through 4 (of 4 total)

 *  Thread Starter [dbraphael](https://wordpress.org/support/users/dbraphael/)
 * (@dbraphael)
 * [13 years, 4 months ago](https://wordpress.org/support/topic/debug-errors-advanced-cachephp/#post-3354905)
 * Here is my site
 *  [Andrew Bartel](https://wordpress.org/support/users/andrew-bartel/)
 * (@andrew-bartel)
 * [13 years, 4 months ago](https://wordpress.org/support/topic/debug-errors-advanced-cachephp/#post-3354962)
 * Do you have any caching plugins? Does disabling them erase the error?
 *  Thread Starter [dbraphael](https://wordpress.org/support/users/dbraphael/)
 * (@dbraphael)
 * [13 years, 4 months ago](https://wordpress.org/support/topic/debug-errors-advanced-cachephp/#post-3354971)
 * I use the Quick Cache plugin. I disabled it and the issue went away.
 * dev.fresnohousing.org
 * Could that be causing slowness for my site?
 * Doug
 *  [Andrew Bartel](https://wordpress.org/support/users/andrew-bartel/)
 * (@andrew-bartel)
 * [13 years, 4 months ago](https://wordpress.org/support/topic/debug-errors-advanced-cachephp/#post-3354975)
 * Sounds like it was, I’d check out a different caching plugin.

Viewing 4 replies - 1 through 4 (of 4 total)

The topic ‘Debug errors: advanced-cache.php’ is closed to new replies.

## Tags

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

 * In: [Fixing WordPress](https://wordpress.org/support/forum/how-to-and-troubleshooting/)
 * 4 replies
 * 2 participants
 * Last reply from: [Andrew Bartel](https://wordpress.org/support/users/andrew-bartel/)
 * Last activity: [13 years, 4 months ago](https://wordpress.org/support/topic/debug-errors-advanced-cachephp/#post-3354975)
 * Status: not resolved

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