Title: Amp Prefix validation error Last modified: October 12, 2016 --- # Amp Prefix validation error * [paulmunford](https://wordpress.org/support/users/paulmunford/) * (@paulmunford) * [9 years, 7 months ago](https://wordpress.org/support/topic/amp-prefix-validation-error/) * Hi Gang, * Is the error below something I need to worry about? Is it something I can fix? * The attribute ‘prefix’ may not appear in tag ‘html ⚡ for top-level html’.