Title: function jetpack_register_block()
Last modified: February 11, 2019

---

# function jetpack_register_block()

 *  Resolved [dwheeler](https://wordpress.org/support/users/dwheeler/)
 * (@dwheeler)
 * [7 years, 3 months ago](https://wordpress.org/support/topic/function-jetpack_register_block/)
 * I have 2 subsites in a wordpress multisite install that have the exact same theme
   and the exacst same plugins.
 * When I activate jetpack on one of the sites I get the error below
 * Call to undefined function jetpack_register_block() in /home/repam/public_html/
   wp-content/plugins/jetpack/modules/shortcodes/email-subscribe.php on line 72
 * The other site I get no errors at all.
    I would like to activate the Jetpack 
   network wide but cannot due to this error.
 * I tried switching themes on the site with the problem and that did not fix the
   error.

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

 *  [Gemma Evans](https://wordpress.org/support/users/gemmaevans/)
 * (@gemmaevans)
 * [7 years, 3 months ago](https://wordpress.org/support/topic/function-jetpack_register_block/#post-11197108)
 * Hi [@dwheeler](https://wordpress.org/support/users/dwheeler/),
 * Would you be able to send a link to the site you are having trouble with?
 * If you would prefer that information to remain private, you can contact us through
   this form instead:
 * [https://jetpack.com/contact-support/?rel=support](https://jetpack.com/contact-support/?rel=support)
 * Thanks!
 *  [esti.m](https://wordpress.org/support/users/estim/)
 * (@estim)
 * [7 years, 3 months ago](https://wordpress.org/support/topic/function-jetpack_register_block/#post-11197142)
 * No problem, for example take this one [http://www.vesperr-studio.pl/sesja-pauliny-plener-z-bl/](http://www.vesperr-studio.pl/sesja-pauliny-plener-z-bl/)
   
   or any other from the posts. I just found out that there was similar problem 
   here [https://wordpress.org/support/topic/blurry-gallery-images/#post-11196774](https://wordpress.org/support/topic/blurry-gallery-images/#post-11196774)
   but there is no solution
 *  [esti.m](https://wordpress.org/support/users/estim/)
 * (@estim)
 * [7 years, 3 months ago](https://wordpress.org/support/topic/function-jetpack_register_block/#post-11197148)
 * Im sorry mu replay should not be here
    please delete it. I took the wrong link
 *  [Gemma Evans](https://wordpress.org/support/users/gemmaevans/)
 * (@gemmaevans)
 * [7 years, 3 months ago](https://wordpress.org/support/topic/function-jetpack_register_block/#post-11200970)
 * Hi [@estim](https://wordpress.org/support/users/estim/),
 * No problem, I won’t reply to the question you posted in this thread.

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

The topic ‘function jetpack_register_block()’ is closed to new replies.

 * ![](https://ps.w.org/jetpack/assets/icon.svg?rev=2819237)
 * [Jetpack - WP Security, Backup, Speed, & Growth](https://wordpress.org/plugins/jetpack/)
 * [Frequently Asked Questions](https://wordpress.org/plugins/jetpack/#faq)
 * [Support Threads](https://wordpress.org/support/plugin/jetpack/)
 * [Active Topics](https://wordpress.org/support/plugin/jetpack/active/)
 * [Unresolved Topics](https://wordpress.org/support/plugin/jetpack/unresolved/)
 * [Reviews](https://wordpress.org/support/plugin/jetpack/reviews/)

## Tags

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

 * 4 replies
 * 3 participants
 * Last reply from: [Gemma Evans](https://wordpress.org/support/users/gemmaevans/)
 * Last activity: [7 years, 3 months ago](https://wordpress.org/support/topic/function-jetpack_register_block/#post-11200970)
 * Status: resolved