Title: Header invalid
Last modified: August 30, 2016

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# Header invalid

 *  Resolved Anonymous User 5731870
 * (@anonymized-5731870)
 * [10 years, 11 months ago](https://wordpress.org/support/topic/header-invalid-1/)
 * Error message appears while trying to activate. Something like: No valid headers.
 * [https://wordpress.org/plugins/jetpack-markdown/](https://wordpress.org/plugins/jetpack-markdown/)

Viewing 1 replies (of 1 total)

 *  Plugin Author [JP](https://wordpress.org/support/users/wpjp/)
 * (@wpjp)
 * [10 years, 10 months ago](https://wordpress.org/support/topic/header-invalid-1/#post-6194096)
 * should be fixed in 3.6+

Viewing 1 replies (of 1 total)

The topic ‘Header invalid’ is closed to new replies.

 * ![](https://s.w.org/plugins/geopattern-icon/jetpack-markdown.svg)
 * [JP Markdown](https://wordpress.org/plugins/jetpack-markdown/)
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 * 1 reply
 * 2 participants
 * Last reply from: [JP](https://wordpress.org/support/users/wpjp/)
 * Last activity: [10 years, 10 months ago](https://wordpress.org/support/topic/header-invalid-1/#post-6194096)
 * Status: resolved