Title: Invalid header
Last modified: August 24, 2016

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# Invalid header

 *  Resolved [Zachary Smith](https://wordpress.org/support/users/zlsmith/)
 * (@zlsmith)
 * [11 years, 1 month ago](https://wordpress.org/support/topic/invalid-header-22/)
 * The plugin deactivates after upgrade due to an invalid header.
 * [https://wordpress.org/plugins/wp-smushit/](https://wordpress.org/plugins/wp-smushit/)

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

 *  [Umesh Kumar](https://wordpress.org/support/users/umeshsingla/)
 * (@umeshsingla)
 * [11 years, 1 month ago](https://wordpress.org/support/topic/invalid-header-22/#post-6013829)
 * Hi [@zachary](https://wordpress.org/support/users/zachary/),
 * What error you get?
 *  [Harris_S](https://wordpress.org/support/users/harris_s/)
 * (@harris_s)
 * [11 years, 1 month ago](https://wordpress.org/support/topic/invalid-header-22/#post-6013913)
 * I have the same problem. After updating, receive this message: “The plugin wp-
   smushit/wp-smushit.php has been deactivated due to an error: The plugin does 
   not have a valid header.”
 *  Plugin Author [WPMU DEV – Your All-in-One WordPress Platform](https://wordpress.org/support/users/wpmudev/)
 * (@wpmudev)
 * [11 years, 1 month ago](https://wordpress.org/support/topic/invalid-header-22/#post-6013923)
 * Unfortunately this was unavoidable because the root plugin filename changed. 
   It’s a one time thing though between upgrade from 1.7.x to 2.x, so no worries!

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

The topic ‘Invalid header’ is closed to new replies.

 * ![](https://ps.w.org/wp-smushit/assets/icon-256x256.gif?rev=3447113)
 * [Smush – Image Optimization, Compression, Lazy Load, WebP & CDN](https://wordpress.org/plugins/wp-smushit/)
 * [Frequently Asked Questions](https://wordpress.org/plugins/wp-smushit/#faq)
 * [Support Threads](https://wordpress.org/support/plugin/wp-smushit/)
 * [Active Topics](https://wordpress.org/support/plugin/wp-smushit/active/)
 * [Unresolved Topics](https://wordpress.org/support/plugin/wp-smushit/unresolved/)
 * [Reviews](https://wordpress.org/support/plugin/wp-smushit/reviews/)

 * 3 replies
 * 4 participants
 * Last reply from: [WPMU DEV – Your All-in-One WordPress Platform](https://wordpress.org/support/users/wpmudev/)
 * Last activity: [11 years, 1 month ago](https://wordpress.org/support/topic/invalid-header-22/#post-6013923)
 * Status: resolved