Title: NextGen Gallery Unknown Error
Last modified: October 6, 2022

---

# NextGen Gallery Unknown Error

 *  Resolved [thedeerkami](https://wordpress.org/support/users/thedeerkami/)
 * (@thedeerkami)
 * [3 years, 8 months ago](https://wordpress.org/support/topic/nextgen-gallery-unknown-error/)
 * Greetings all, a beginner here. I am trying to install the plugin and the download
   as well as the version is fine. As soon as I click on “activate” I get the error:“
   The plugin does not have a valid header” which I don’t quite understand. I would
   appreciate any tips or suggestions on what I should do in case this is on my 
   end.
 * Localhost website (personal project)
    No other plugin conflicts, tested. Latest
   WordPress version.

Viewing 4 replies - 1 through 4 (of 4 total)

 *  [Jaime Segura](https://wordpress.org/support/users/jaimeimagely/)
 * (@jaimeimagely)
 * [3 years, 8 months ago](https://wordpress.org/support/topic/nextgen-gallery-unknown-error/#post-16076488)
 * Hi,
 * I will pass this info to our developers, if you go to Plugins, can you see the
   plugin there? Does it activate properly? It has happened to me a couple times
   over the years, but never really paid much attention to this, I thought it was
   just a server hiccup.
 * Keep me posted on how it went.
 *  Thread Starter [thedeerkami](https://wordpress.org/support/users/thedeerkami/)
 * (@thedeerkami)
 * [3 years, 8 months ago](https://wordpress.org/support/topic/nextgen-gallery-unknown-error/#post-16076545)
 * Yes, I tried it appears deactivated and no matter how many times I try it keeps
   giving me the same error. I appreciate your response. Looking forward to a possible
   solution.
 *  Plugin Contributor [Imagely](https://wordpress.org/support/users/imagely/)
 * (@imagely)
 * [3 years, 8 months ago](https://wordpress.org/support/topic/nextgen-gallery-unknown-error/#post-16077779)
 * Hi [@thedeerkami](https://wordpress.org/support/users/thedeerkami/),
 * Could you please try deleting NGG ( and also make sure by FTP that the entire`
   nextgen-gallery` folder is removed ) then re-download NGG from [https://wordpress.org/support/plugin/nextgen-gallery/](https://wordpress.org/support/plugin/nextgen-gallery/)
   and manually install it new from your site’s `"Dashboard -> Plugins -> Add new-
   > Upload plugin"` to see if that’ll change anything?
 *  Thread Starter [thedeerkami](https://wordpress.org/support/users/thedeerkami/)
 * (@thedeerkami)
 * [3 years, 8 months ago](https://wordpress.org/support/topic/nextgen-gallery-unknown-error/#post-16078067)
 * Thank you for your suggestion, yesterday night apparently there was an update
   for the plugin, and today when I updated it worked perfectly, thank you so much
   for your support and suggestion! Cheers!

Viewing 4 replies - 1 through 4 (of 4 total)

The topic ‘NextGen Gallery Unknown Error’ is closed to new replies.

 * ![](https://ps.w.org/nextgen-gallery/assets/icon-256x256.png?rev=2083961)
 * [Photo Gallery, Sliders, Proofing and Themes - NextGEN Gallery](https://wordpress.org/plugins/nextgen-gallery/)
 * [Frequently Asked Questions](https://wordpress.org/plugins/nextgen-gallery/#faq)
 * [Support Threads](https://wordpress.org/support/plugin/nextgen-gallery/)
 * [Active Topics](https://wordpress.org/support/plugin/nextgen-gallery/active/)
 * [Unresolved Topics](https://wordpress.org/support/plugin/nextgen-gallery/unresolved/)
 * [Reviews](https://wordpress.org/support/plugin/nextgen-gallery/reviews/)

 * 4 replies
 * 3 participants
 * Last reply from: [thedeerkami](https://wordpress.org/support/users/thedeerkami/)
 * Last activity: [3 years, 8 months ago](https://wordpress.org/support/topic/nextgen-gallery-unknown-error/#post-16078067)
 * Status: resolved