Title: Error After Update from Webmaster Tools
Last modified: October 10, 2016

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# Error After Update from Webmaster Tools

 *  [mdotk](https://wordpress.org/support/users/mdotk/)
 * (@mdotk)
 * [9 years, 8 months ago](https://wordpress.org/support/topic/error-after-update-from-webmaster-tools/)
 * None of my pages validate now
 * “The attribute ‘prefix’ may not appear in tag ‘html ⚡ for top-level html’.”

Viewing 1 replies (of 1 total)

 *  [Mohammad Jangda](https://wordpress.org/support/users/batmoo/)
 * (@batmoo)
 * [9 years, 8 months ago](https://wordpress.org/support/topic/error-after-update-from-webmaster-tools/#post-8274474)
 * Can you share the AMP URL for one of your posts? There is likely another plugin
   or your theme that is inserting the `prefix` attribute to the `html` tag via 
   the `language_attributes` filter.

Viewing 1 replies (of 1 total)

The topic ‘Error After Update from Webmaster Tools’ is closed to new replies.

 * ![](https://ps.w.org/amp/assets/icon.svg?rev=2527602)
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 * [Unresolved Topics](https://wordpress.org/support/plugin/amp/unresolved/)
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 * 1 reply
 * 2 participants
 * Last reply from: [Mohammad Jangda](https://wordpress.org/support/users/batmoo/)
 * Last activity: [9 years, 8 months ago](https://wordpress.org/support/topic/error-after-update-from-webmaster-tools/#post-8274474)
 * Status: not resolved