Title: CRASH ERROR
Last modified: June 21, 2021

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# CRASH ERROR

 *  Resolved [Netz](https://wordpress.org/support/users/netz/)
 * (@netz)
 * [4 years, 11 months ago](https://wordpress.org/support/topic/crash-error/)
 * Hi,
 * Webshop Woocommerce DOWN … CRASHED!
    Here is the error:
 *     ```
       [21-Jun-2021 03:07:05 UTC] PHP Fatal error:  Uncaught Error: Call to undefined function WP_Optimize() in /public_html/wp-content/plugins/wp-optimize/cache/file-based-page-cache-functions.php:178
       Stack trace:
       #0 [internal function]: wpo_cache()
       #1 /public_html/wp-includes/functions.php(4757): ob_end_flush()
       #2 /public_html/wp-includes/class-wp-hook.php(292): wp_ob_end_flush_all()
       #3 /public_html/wp-includes/class-wp-hook.php(316): WP_Hook->apply_filters()
       #4 /public_html/wp-includes/plugin.php(484): WP_Hook->do_action()
       #5 /public_html/wp-includes/load.php(1072): do_action()
       #6 [internal function]: shutdown_action_hook()
       #7 {main}
         thrown in /public_html/wp-content/plugins/wp-optimize/cache/file-based-page-cache-functions.php on line 178
       ```
   
 * Never pays to use free plugins? – Do you pro version have the same error?
 * Netz
 * The page I need help with: _[[log in](https://login.wordpress.org/?redirect_to=https%3A%2F%2Fwordpress.org%2Fsupport%2Ftopic%2Fcrash-error%2F%3Foutput_format%3Dmd&locale=en_US)
   to see the link]_

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

 *  [Harshad](https://wordpress.org/support/users/bornforphp/)
 * (@bornforphp)
 * [4 years, 11 months ago](https://wordpress.org/support/topic/crash-error/#post-14581582)
 * [@netz](https://wordpress.org/support/users/netz/) It looks like some core WP-
   Optimize files are missing.
 * Could you please try to re-upload the plugin files via FTP/SFTP?
 * To do this:
 * 1. Unzip the WP-Optimize ZIP on your local machine, using a zip utility such 
   as 7-zip.
    2. Access your WordPress installation via FTP or your host’s filemanager.
   3. Navigate to wp-content/plugins. Upload the WP-Optimize folder here. 4. Go 
   to the Plugins page on your WordPress dashboard. You should see WP-Optimize in
   the list of plugins.`
 * Let us know if uploading the files via FTP/SFTP helps to fix the issue?
 *  Thread Starter [Netz](https://wordpress.org/support/users/netz/)
 * (@netz)
 * [4 years, 10 months ago](https://wordpress.org/support/topic/crash-error/#post-14745824)
 * Hi,
    No files is missing – I did a complete compare – bit by bit Same issue 🙁

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

The topic ‘CRASH ERROR’ is closed to new replies.

 * ![](https://ps.w.org/wp-optimize/assets/icon-256x256.png?rev=1552899)
 * [WP-Optimize – Cache, Compress images, Minify & Clean database to boost page speed & performance](https://wordpress.org/plugins/wp-optimize/)
 * [Frequently Asked Questions](https://wordpress.org/plugins/wp-optimize/#faq)
 * [Support Threads](https://wordpress.org/support/plugin/wp-optimize/)
 * [Active Topics](https://wordpress.org/support/plugin/wp-optimize/active/)
 * [Unresolved Topics](https://wordpress.org/support/plugin/wp-optimize/unresolved/)
 * [Reviews](https://wordpress.org/support/plugin/wp-optimize/reviews/)

## Tags

 * [Crash](https://wordpress.org/support/topic-tag/crash/)

 * 2 replies
 * 2 participants
 * Last reply from: [Netz](https://wordpress.org/support/users/netz/)
 * Last activity: [4 years, 10 months ago](https://wordpress.org/support/topic/crash-error/#post-14745824)
 * Status: resolved