Title: Setting up fake worker failed Error Message
Last modified: July 16, 2023

---

# Setting up fake worker failed Error Message

 *  Resolved [mirzasaeed](https://wordpress.org/support/users/mirzasaeed/)
 * (@mirzasaeed)
 * [2 years, 10 months ago](https://wordpress.org/support/topic/setting-up-fake-worker-failed-error-message/)
 * I have installed the 10web booster plugin on my site. it works fine, very amazing
   plugin. I really impressed. although an error message appears on my homepage 
   afer installing the said plugin”Setting up fake worker failed: “Cannot read properties
   of undefined (reading ‘WorkerMessageHandler’)”. ” I think that is related to 
   cache, minify or pdf embedder plugin. if any solution please guide to resolve
   it.
 * Mirza Saeed Ahmed Chughtai
 * The page I need help with: _[[log in](https://login.wordpress.org/?redirect_to=https%3A%2F%2Fwordpress.org%2Fsupport%2Ftopic%2Fsetting-up-fake-worker-failed-error-message%2F%3Foutput_format%3Dmd&locale=en_US)
   to see the link]_

Viewing 1 replies (of 1 total)

 *  Plugin Support [Nik](https://wordpress.org/support/users/nikitaanisimov/)
 * (@nikitaanisimov)
 * [2 years, 10 months ago](https://wordpress.org/support/topic/setting-up-fake-worker-failed-error-message/#post-16899443)
 * Hello [@mirzasaeed](https://wordpress.org/support/users/mirzasaeed/) –
 * yes this error is indeed observed sometimes when Booster and Embedder plugin 
   are both active on the site,
 * Is it causing any tangible front-end errors or issues with PDF embeds? If so,
   you could exclude PDF Embedder from CSS/JS optimization done by our Speed Booster
    - [How to Locate and Exclude CSS Files in 10Web Booster](https://help.10web.io/hc/en-us/articles/12020019606802-How-to-locate-and-exclude-CSS-files-in-the-10Web-Website-Booster)
    - [How to Locate and Exclude JS Files in 10Web Booster](https://help.10web.io/hc/en-us/articles/12020189458706-How-to-locate-and-exclude-JS-files-in-the-10Web-Website-Booster)
 * Please let me know if you have any further questions =)

Viewing 1 replies (of 1 total)

The topic ‘Setting up fake worker failed Error Message’ is closed to new replies.

 * ![](https://ps.w.org/tenweb-speed-optimizer/assets/icon-256x256.png?rev=2753401)
 * [10Web Booster - Website speed optimization, Cache & Page Speed optimizer](https://wordpress.org/plugins/tenweb-speed-optimizer/)
 * [Frequently Asked Questions](https://wordpress.org/plugins/tenweb-speed-optimizer/#faq)
 * [Support Threads](https://wordpress.org/support/plugin/tenweb-speed-optimizer/)
 * [Active Topics](https://wordpress.org/support/plugin/tenweb-speed-optimizer/active/)
 * [Unresolved Topics](https://wordpress.org/support/plugin/tenweb-speed-optimizer/unresolved/)
 * [Reviews](https://wordpress.org/support/plugin/tenweb-speed-optimizer/reviews/)

 * 1 reply
 * 2 participants
 * Last reply from: [Nik](https://wordpress.org/support/users/nikitaanisimov/)
 * Last activity: [2 years, 10 months ago](https://wordpress.org/support/topic/setting-up-fake-worker-failed-error-message/#post-16899443)
 * Status: resolved