Title: can't activate plugin (invalid header) Last modified: August 30, 2016 --- # can't activate plugin (invalid header) * Resolved [pep86](https://wordpress.org/support/users/pep86/) * (@pep86) * [10 years, 8 months ago](https://wordpress.org/support/topic/cant-activate-plugin-invalid-header/) * Hi, * I am unable to activate plugin. 🙁 * P. * [https://wordpress.org/plugins/wp-smushit/](https://wordpress.org/plugins/wp-smushit/) Viewing 14 replies - 1 through 14 (of 14 total) * [Umesh Kumar](https://wordpress.org/support/users/umeshsingla/) * (@umeshsingla) * [10 years, 8 months ago](https://wordpress.org/support/topic/cant-activate-plugin-invalid-header/#post-6653919) * Hi [@pep86](https://wordpress.org/support/users/pep86/), * It’s just says invalid header? * Any other error you see? * Can you please try deleting the plugin, reinstall and activate it. * Cheers * Thread Starter [pep86](https://wordpress.org/support/users/pep86/) * (@pep86) * [10 years, 8 months ago](https://wordpress.org/support/topic/cant-activate-plugin-invalid-header/#post-6653921) * I have already tried but it didnt help. I was looking for empty rows but no luck. * When I activate it says modul activated and then modul deactivated because of error: invalid header * Thread Starter [pep86](https://wordpress.org/support/users/pep86/) * (@pep86) * [10 years, 8 months ago](https://wordpress.org/support/topic/cant-activate-plugin-invalid-header/#post-6653922) * I tried on two different servers I have and its the same on both of them * Thread Starter [pep86](https://wordpress.org/support/users/pep86/) * (@pep86) * [10 years, 8 months ago](https://wordpress.org/support/topic/cant-activate-plugin-invalid-header/#post-6653932) * A little update: I downloaded 2.6.0, uploaded and installed – it works. * When I hit update it updates but plugin becomes deactivated and I cant reactivate with “invalid header” message again. * Thx * [Umesh Kumar](https://wordpress.org/support/users/umeshsingla/) * (@umeshsingla) * [10 years, 8 months ago](https://wordpress.org/support/topic/cant-activate-plugin-invalid-header/#post-6653948) * Hi [@pep86](https://wordpress.org/support/users/pep86/), * I’m sorry, but I’m unable to replicate this one, , It’d be awesome If you can help us by sending the site login and FTP details. * Can you please go to: [https://premium.wpmudev.org/contact/](https://premium.wpmudev.org/contact/), and contact us using this template: * Subject: “Attn: Umesh Kumar” -link back to this thread for reference -any other relevant urls * Select “I have a different question” for your topic – this and the subject line ensure that it gets assigned to me 🙂 * Cheers * [RenaudT](https://wordpress.org/support/users/renaudt/) * (@renaudt) * [10 years, 8 months ago](https://wordpress.org/support/topic/cant-activate-plugin-invalid-header/#post-6653967) * Hi ! It’s the same for me, i have now update the extension, and i have the same error. If you have a solution, i’m OK 🙂 * Plugin Support [Saurabh – WPMU DEV Support](https://wordpress.org/support/users/wpmudev-support7/) * (@wpmudev-support7) * [10 years, 7 months ago](https://wordpress.org/support/topic/cant-activate-plugin-invalid-header/#post-6654003) * Hi [@renaudt](https://wordpress.org/support/users/renaudt/) * Can you please go to: [https://premium.wpmudev.org/contact/](https://premium.wpmudev.org/contact/), and contact us using this template: * Subject: “Attn: Umesh Kumar” -link back to this thread for reference -any other relevant urls * Select “I have a different question” for your topic – this and the subject line ensure that it gets assigned to Umesh 🙂 * Have a great day! * [Umesh Kumar](https://wordpress.org/support/users/umeshsingla/) * (@umeshsingla) * [10 years, 7 months ago](https://wordpress.org/support/topic/cant-activate-plugin-invalid-header/#post-6654016) * Hi [@pep86](https://wordpress.org/support/users/pep86/), [@renaudt](https://wordpress.org/support/users/renaudt/), * Does the latest update fixes the issue for you, if it doesn’t, I’ll need the details from you through above template, which Tom have posted for you. * Cheers * [RenaudT](https://wordpress.org/support/users/renaudt/) * (@renaudt) * [10 years, 7 months ago](https://wordpress.org/support/topic/cant-activate-plugin-invalid-header/#post-6654017) * Hi ! Same error, in Wamp local and in-line too. “L’extension wp-smushit a Ă©tĂ© dĂ©sactivĂ©e suit Ă  l’erreur : Cette extension ne dispose pas d’un en-tĂȘte valide.” I’m in wordpress 3.5.2, and I go to last version of WP in a few months, us have a lot of tests to praticate before migrate.. But all extensions are on and functionnals without problems.. Its only this update of 3 days ago, that smushit have an error @ update. Would you more details ? * Great day ! * Renaud T. * [Umesh Kumar](https://wordpress.org/support/users/umeshsingla/) * (@umeshsingla) * [10 years, 7 months ago](https://wordpress.org/support/topic/cant-activate-plugin-invalid-header/#post-6654018) * [@renaudt](https://wordpress.org/support/users/renaudt/), * > Would you more details ? * Yeah, it’d be quicker for me to test the issue. * The latest version is 2.0.6.5. * [RenaudT](https://wordpress.org/support/users/renaudt/) * (@renaudt) * [10 years, 7 months ago](https://wordpress.org/support/topic/cant-activate-plugin-invalid-header/#post-6654019) * [@umesh](https://wordpress.org/support/users/umesh/) Yes thanks ! But I have write this message after the last update 2.0.6.5.. And i have the same issue unfortunately.. * [Umesh Kumar](https://wordpress.org/support/users/umeshsingla/) * (@umeshsingla) * [10 years, 7 months ago](https://wordpress.org/support/topic/cant-activate-plugin-invalid-header/#post-6654020) * [@renaudt](https://wordpress.org/support/users/renaudt/), I’ll take a look, once you send me the details through our contact form. * Thanks * [RenaudT](https://wordpress.org/support/users/renaudt/) * (@renaudt) * [10 years, 7 months ago](https://wordpress.org/support/topic/cant-activate-plugin-invalid-header/#post-6654022) * [@umesh](https://wordpress.org/support/users/umesh/) Mail send to contact form. Thanks. * [Umesh Kumar](https://wordpress.org/support/users/umeshsingla/) * (@umeshsingla) * [10 years, 7 months ago](https://wordpress.org/support/topic/cant-activate-plugin-invalid-header/#post-6654047) * Hi [@pep86](https://wordpress.org/support/users/pep86/), * Invalid header issue is fixed in latest release i.e 2.0.7. * Cheers Viewing 14 replies - 1 through 14 (of 14 total) The topic ‘can't activate plugin (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/) * 14 replies * 4 participants * Last reply from: [Umesh Kumar](https://wordpress.org/support/users/umeshsingla/) * Last activity: [10 years, 7 months ago](https://wordpress.org/support/topic/cant-activate-plugin-invalid-header/#post-6654047) * Status: resolved