Title: Fatal error: Unknown
Last modified: August 30, 2016

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# Fatal error: Unknown

 *  Resolved [brightculture](https://wordpress.org/support/users/brightculture/)
 * (@brightculture)
 * [10 years, 9 months ago](https://wordpress.org/support/topic/fatal-error-unknown-4/)
 * Hi,
 * Great plugin that has improved my Page Speed score.
 * However, I do have 2 problems while using this plugin.
 * When i run Google Pagespeed, i get these 2 problems.
 * 1) I get this “Fatal Error. Unknown…”
 * Use legible font sizes
    The following text on your page renders in a way that
   may be difficult for some of your visitors to read. Use legible font sizes to
   provide a better user experience. The following text fragments have a small font
   size. Increase the font size to make them more legible.
 * 2) Configure the viewport
 * Your page does not have a viewport specified. This causes mobile devices to render
   your page as it would appear on a desktop browser, scaling it down to fit on 
   a mobile screen. Configure a viewport to allow your page to render properly on
   all devices.
 * How do i solve these 2 problems?
 * [https://wordpress.org/plugins/autoptimize/](https://wordpress.org/plugins/autoptimize/)

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

 *  Plugin Author [Frank Goossens](https://wordpress.org/support/users/futtta/)
 * (@futtta)
 * [10 years, 9 months ago](https://wordpress.org/support/topic/fatal-error-unknown-4/#post-6533577)
 * both font size & viewport are not something that AO can change/ improve brightculture,
   this should be handled/ improved at theme level.
 * hope this helps,
    frank
 *  [meijin2k](https://wordpress.org/support/users/meijin2k/)
 * (@meijin2k)
 * [10 years, 9 months ago](https://wordpress.org/support/topic/fatal-error-unknown-4/#post-6533613)
 * Sorry, wrong thread.

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

The topic ‘Fatal error: Unknown’ is closed to new replies.

 * ![](https://ps.w.org/autoptimize/assets/icon-256X256.png?rev=2211608)
 * [Autoptimize](https://wordpress.org/plugins/autoptimize/)
 * [Frequently Asked Questions](https://wordpress.org/plugins/autoptimize/#faq)
 * [Support Threads](https://wordpress.org/support/plugin/autoptimize/)
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 * [Unresolved Topics](https://wordpress.org/support/plugin/autoptimize/unresolved/)
 * [Reviews](https://wordpress.org/support/plugin/autoptimize/reviews/)

## Tags

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

 * 2 replies
 * 3 participants
 * Last reply from: [meijin2k](https://wordpress.org/support/users/meijin2k/)
 * Last activity: [10 years, 9 months ago](https://wordpress.org/support/topic/fatal-error-unknown-4/#post-6533613)
 * Status: resolved