Title: Fatal Error, using JavaScript option
Last modified: December 5, 2016

---

# Fatal Error, using JavaScript option

 *  Resolved [madsteve](https://wordpress.org/support/users/madsteve/)
 * (@madsteve)
 * [9 years, 6 months ago](https://wordpress.org/support/topic/fatal-error-using-javascript-option/)
 * Hey,
 * I get this message when i use the JavaScript option.
 * Fatal error: Unknown: Cannot use output buffering in output buffering display
   handlers in Unknown on line 0
 * My website is [http://www.crossfitnorthdevon.com](http://www.crossfitnorthdevon.com)
   if thats any help.
 * Many thanks

Viewing 3 replies - 1 through 3 (of 3 total)

 *  Plugin Author [Frank Goossens](https://wordpress.org/support/users/futtta/)
 * (@futtta)
 * [9 years, 6 months ago](https://wordpress.org/support/topic/fatal-error-using-javascript-option/#post-8516815)
 * given `http://www.crossfitnorthdevon.com/wp-content/cache/minify/80d00.default.
   include.cea217.js?x33268` in your HTML source, you’ve got another plugin doing
   minification, which -as minifiers are a jealous bunch- is a big nono 🙂
 * frank
 *  Thread Starter [madsteve](https://wordpress.org/support/users/madsteve/)
 * (@madsteve)
 * [9 years, 6 months ago](https://wordpress.org/support/topic/fatal-error-using-javascript-option/#post-8516985)
 * AH i see.
 * Yes i do Frank. Im using W3 Total Cache.
 * Whats the procedure with working with both plug-ins?
 * Im trying to use W3’s Minify settings to paste Googles Page Speeds JavaScript
   code into. Its not working out, but i may be messing that up as well. Doh
 * Many thanks
    -  This reply was modified 9 years, 6 months ago by [madsteve](https://wordpress.org/support/users/madsteve/).
 *  Plugin Author [Frank Goossens](https://wordpress.org/support/users/futtta/)
 * (@futtta)
 * [9 years, 6 months ago](https://wordpress.org/support/topic/fatal-error-using-javascript-option/#post-8517076)
 * well, as per [the FAQ](https://wordpress.org/plugins/autoptimize/faq/), you’ll
   have to disable all minification (CSS, JS, HTML) in other plugins (e.g. W3TC)
   when using autoptimize.

Viewing 3 replies - 1 through 3 (of 3 total)

The topic ‘Fatal Error, using JavaScript option’ 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/)
 * [Active Topics](https://wordpress.org/support/plugin/autoptimize/active/)
 * [Unresolved Topics](https://wordpress.org/support/plugin/autoptimize/unresolved/)
 * [Reviews](https://wordpress.org/support/plugin/autoptimize/reviews/)

 * 3 replies
 * 2 participants
 * Last reply from: [Frank Goossens](https://wordpress.org/support/users/futtta/)
 * Last activity: [9 years, 6 months ago](https://wordpress.org/support/topic/fatal-error-using-javascript-option/#post-8517076)
 * Status: resolved