Title: Error Message
Last modified: August 6, 2025

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# Error Message

 *  Resolved [twocrumbsup](https://wordpress.org/support/users/twocrumbsup/)
 * (@twocrumbsup)
 * [9 months, 3 weeks ago](https://wordpress.org/support/topic/error-message-1069/)
 * Hi– when I try to regenerate my critical css, I get this error message:
 * Failed to load Speed Scores
 * An error occurred while trying to communicate with the site REST API. Extra debug
   info: {“requestInitiator”:”[https://twocrumbsup.co/wp-admin/admin.php?page=jetpack-boost&#8221](https://twocrumbsup.co/wp-admin/admin.php?page=jetpack-boost&#8221);,”
   requestUrl”:”[https://twocrumbsup.co/wp-json/jetpack-boost/v1/speed-scores&#8221](https://twocrumbsup.co/wp-json/jetpack-boost/v1/speed-scores&#8221);,”
   requestArgs”:{“method”:”post”,”mode”:”cors”,”headers”:{“Content-Type”:”application/
   json”}},”originalErrorMessage”:”TypeError: Load failed”}
 * Is there something I can do to fix?

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

 *  Plugin Support [Alin (a11n)](https://wordpress.org/support/users/alinclamba/)
 * (@alinclamba)
 * [9 months, 3 weeks ago](https://wordpress.org/support/topic/error-message-1069/#post-18589012)
 * Hi [@twocrumbsup](https://wordpress.org/support/users/twocrumbsup/),
 * Thanks for reaching out, and great question!
 * That error when trying to regenerate your Critical CSS is usually caused by Jetpack
   Boost not being able to access your site’s REST API — and in your case, I spotted
   the exact reason:
 * > `API calls to this blog have been disabled.`
 * This happens when the **Jetpack JSON API** module is turned off. Boost (and a
   few other Jetpack features) rely on it to fetch speed scores and run optimizations
   like Critical CSS.
 * To fix this, you can enable JSON API for your site here:
 * [https://twocrumbsup.co/wp-admin/admin.php?page=jetpack_modules&s=api](https://twocrumbsup.co/wp-admin/admin.php?page=jetpack_modules&s=api)
 * Once enabled, try regenerating your Critical CSS again from the Boost settings
   page. It should work as expected!
 * Let us know how it goes — happy to take another look if the error sticks around.
 *  Plugin Support [Stef (a11n)](https://wordpress.org/support/users/erania-pinnera/)
 * (@erania-pinnera)
 * [9 months, 1 week ago](https://wordpress.org/support/topic/error-message-1069/#post-18599928)
 * Hi there, [@twocrumbsup](https://wordpress.org/support/users/twocrumbsup/),
 * Do you have updates about that, do you still need help? We usually close inactive
   threads after one week of no movement, but we want to make sure we’re all set
   before marking it as solved. Thanks!

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

The topic ‘Error Message’ is closed to new replies.

 * ![](https://ps.w.org/jetpack-boost/assets/icon.svg?rev=2818794)
 * [Jetpack Boost - Website Speed, Performance and Critical CSS](https://wordpress.org/plugins/jetpack-boost/)
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 * [Unresolved Topics](https://wordpress.org/support/plugin/jetpack-boost/unresolved/)
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 * 2 replies
 * 3 participants
 * Last reply from: [Stef (a11n)](https://wordpress.org/support/users/erania-pinnera/)
 * Last activity: [9 months, 1 week ago](https://wordpress.org/support/topic/error-message-1069/#post-18599928)
 * Status: resolved