Title: Worker Message Handler error
Last modified: March 11, 2020

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# Worker Message Handler error

 *  Resolved [myetutors](https://wordpress.org/support/users/myetutors/)
 * (@myetutors)
 * [6 years, 3 months ago](https://wordpress.org/support/topic/worker-message-handler-error/)
 * Hi,
    Support PDF Embedder, I am using the plugin. But recently the plugin is 
   not displaying the pdf and is showing error “setting up fake worker failed cannot
   read property WorkerMessageHandler of undefined” To see the error just click 
   any button on the link page and on new page will show the error and no pdf is
   shown. The changes I have done on the site added SEOpress pro plugin and the 
   hosting provider has started CDN on Cloudflare basic plan. Please advise me. 
   Thanks
 * The page I need help with: _[[log in](https://login.wordpress.org/?redirect_to=https%3A%2F%2Fwordpress.org%2Fsupport%2Ftopic%2Fworker-message-handler-error%2F%3Foutput_format%3Dmd&locale=en_US)
   to see the link]_

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

 *  [PDFG Support](https://wordpress.org/support/users/wppdfsupport/)
 * (@wppdfsupport)
 * [6 years, 2 months ago](https://wordpress.org/support/topic/worker-message-handler-error/#post-12536947)
 * Hi [@myetutors](https://wordpress.org/support/users/myetutors/),
 * There are a couple of things you need to look into, the first being the new CDN.
   Configuration of CORS (cross-origin resource sharing) is the first place to start.
   We have instructions here: [https://wp-pdf.com/kb/hosting-pdfs-on-other-services-such-as-amazon-s3/](https://wp-pdf.com/kb/hosting-pdfs-on-other-services-such-as-amazon-s3/).
 * This is usually enough to resolve the issue of missing PDFs. If not, proceed 
   to the second step: [https://wp-pdf.com/kb/setting-up-fake-worker-failed-error-message/](https://wp-pdf.com/kb/setting-up-fake-worker-failed-error-message/).
 * If you have any other questions, please feel free to send an email to [contact@wp-pdf.com](https://wordpress.org/support/topic/worker-message-handler-error/contact@wp-pdf.com?output_format=md)
   as we may not see messages posted here to respond in a timely fashion.
 * Emma
 *  [connsortia](https://wordpress.org/support/users/connsortia/)
 * (@connsortia)
 * [5 years, 10 months ago](https://wordpress.org/support/topic/worker-message-handler-error/#post-13172679)
 * Hi,
    I am having this issue as well, however, I am not savvy enough to understand
   the instructions in the links of the fixes. I am hot hosting a PDF on another
   site, I am hosting it in my site’s media gallery, but am getting this error when
   i plug the shortcode into a Divi theme code module. Divi support did a test with
   my PDF and the exact same code on a test Divi themed website and it worked fine.
 * Perhaps a plugin is in the way, or if not, and I do have to do what you suggest
   in the first solve above, could you further explain where i go to make the changes
   that are talked about in the fix?

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

The topic ‘Worker Message Handler error’ is closed to new replies.

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 * 2 replies
 * 3 participants
 * Last reply from: [connsortia](https://wordpress.org/support/users/connsortia/)
 * Last activity: [5 years, 10 months ago](https://wordpress.org/support/topic/worker-message-handler-error/#post-13172679)
 * Status: resolved