Title: error valid header
Last modified: December 21, 2025

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# error valid header

 *  Resolved [hamidsna](https://wordpress.org/support/users/hamidsna/)
 * (@hamidsna)
 * [5 months, 1 week ago](https://wordpress.org/support/topic/error-valid-header/)
 * I recently updated the plugin and I am getting this error on two different sites.
 * The plugin `admin-category-filter/category-filter.php` has been deactivated due
   to an error: The plugin does not have a valid header.

Viewing 1 replies (of 1 total)

 *  Plugin Author [Ivijan-Stefan Stipic](https://wordpress.org/support/users/ivijanstefan/)
 * (@ivijanstefan)
 * [5 months, 1 week ago](https://wordpress.org/support/topic/error-valid-header/#post-18763937)
 * Hello,
 * Please reactivate plugin or just reinstall it and will work.
 * Filename is changed and some WP installations cache the old path and broke it.
 * After that will work properly.

Viewing 1 replies (of 1 total)

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 * ![](https://ps.w.org/admin-category-filter/assets/icon-256x256.png?rev=3413054)
 * [Post Category Filter (WP Admin)](https://wordpress.org/plugins/admin-category-filter/)
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 * 1 reply
 * 2 participants
 * Last reply from: [Ivijan-Stefan Stipic](https://wordpress.org/support/users/ivijanstefan/)
 * Last activity: [5 months, 1 week ago](https://wordpress.org/support/topic/error-valid-header/#post-18763937)
 * Status: resolved