Title: PHP Warning even though plugin is deactivated
Last modified: February 15, 2020

---

# PHP Warning even though plugin is deactivated

 *  Resolved [Carl Gross](https://wordpress.org/support/users/carlgross/)
 * (@carlgross)
 * [6 years, 3 months ago](https://wordpress.org/support/topic/php-warning-even-though-plugin-is-deactivated/)
 * Hello. I have the plugin installed on my live site ([https://samuigoddess.com/](https://samuigoddess.com/)),
   and my staging site ([https://staging3.samuigoddess.com/](https://staging3.samuigoddess.com/)).
   The plugin is activated on my live site, and deactivated on my staging site. 
   But in my staging site error log, is this line repeated several times:
 * `[15-Feb-2020 11:36:21 UTC] PHP Warning: include_once(): Failed opening '/home/
   samuigod/staging/3/wp-content/plugins/hummingbird-performance/core/class-abstract-
   module.php' for inclusion (include_path='.:/usr/local/php71/pear') in /home/samuigod/
   staging/3/wp-content/advanced-cache.php on line 24`
 * If the plugin is deactivated, why is that warning occurring? The message is printed
   constantly, seemingly on ever page load (front-end or back-end).
 * The reason I ask is because I just updated the WooCommerce plugin, and after,
   WC indicated that it needed to update the database. When I began that process,
   it hung indefinitely. So I’m just trying to resolve all PHP errors for now, and
   yours is the only one I see.
 * Thanks in advance.

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

 *  [Anton Vanyukov](https://wordpress.org/support/users/vanyukov/)
 * (@vanyukov)
 * [6 years, 3 months ago](https://wordpress.org/support/topic/php-warning-even-though-plugin-is-deactivated/#post-12443337)
 * Hi [@carlgross](https://wordpress.org/support/users/carlgross/),
 * Please remove the file /home/samuigod/staging/3/wp-content/advanced-cache.php
 * Best regards,
    Anton
 *  Thread Starter [Carl Gross](https://wordpress.org/support/users/carlgross/)
 * (@carlgross)
 * [6 years, 3 months ago](https://wordpress.org/support/topic/php-warning-even-though-plugin-is-deactivated/#post-12443672)
 * OK thanks. That seems to have resolved the issue.
 * For the future, when I deactivate the plugin, will I always have to manually 
   delete this file?
 *  [Anton Vanyukov](https://wordpress.org/support/users/vanyukov/)
 * (@vanyukov)
 * [6 years, 3 months ago](https://wordpress.org/support/topic/php-warning-even-though-plugin-is-deactivated/#post-12443706)
 * [@carlgross](https://wordpress.org/support/users/carlgross/),
 * No, this was a glitch that seemed to only happen during the WordPress 5.3.0 update
   on a small number of installs. Hummingbird should auto remove/add this file if
   you activate/deactivate page caching module or disable the plugin.
 * Best regards,
    Anton
 *  Thread Starter [Carl Gross](https://wordpress.org/support/users/carlgross/)
 * (@carlgross)
 * [6 years, 2 months ago](https://wordpress.org/support/topic/php-warning-even-though-plugin-is-deactivated/#post-12472935)
 * OK thanks for that clarification. We can consider this resolved.

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

The topic ‘PHP Warning even though plugin is deactivated’ is closed to new replies.

 * ![](https://ps.w.org/hummingbird-performance/assets/icon-256x256.gif?rev=2633221)
 * [Hummingbird Performance - Cache & Page Speed Optimization for Core Web Vitals | Critical CSS | Minify CSS | Defer CSS Javascript | CDN](https://wordpress.org/plugins/hummingbird-performance/)
 * [Frequently Asked Questions](https://wordpress.org/plugins/hummingbird-performance/#faq)
 * [Support Threads](https://wordpress.org/support/plugin/hummingbird-performance/)
 * [Active Topics](https://wordpress.org/support/plugin/hummingbird-performance/active/)
 * [Unresolved Topics](https://wordpress.org/support/plugin/hummingbird-performance/unresolved/)
 * [Reviews](https://wordpress.org/support/plugin/hummingbird-performance/reviews/)

 * 4 replies
 * 2 participants
 * Last reply from: [Carl Gross](https://wordpress.org/support/users/carlgross/)
 * Last activity: [6 years, 2 months ago](https://wordpress.org/support/topic/php-warning-even-though-plugin-is-deactivated/#post-12472935)
 * Status: resolved