Title: Error message upon activation
Last modified: August 20, 2016

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# Error message upon activation

 *  [rhinojos](https://wordpress.org/support/users/rhinojos/)
 * (@rhinojos)
 * [13 years, 6 months ago](https://wordpress.org/support/topic/error-message-upon-activation/)
 * “The plugin does not have a valid header.”
 * Is what Im getting. Any advice?
 * [http://wordpress.org/extend/plugins/schemeable-sliding-panel/](http://wordpress.org/extend/plugins/schemeable-sliding-panel/)

Viewing 9 replies - 1 through 9 (of 9 total)

 *  Plugin Author [kdmurthy](https://wordpress.org/support/users/kdmurthy/)
 * (@kdmurthy)
 * [13 years, 6 months ago](https://wordpress.org/support/topic/error-message-upon-activation/#post-3201360)
 * Are you using Windows? Looks like the problem is only on Windows. Working on 
   a fix and shall post soon.
 *  Plugin Author [kdmurthy](https://wordpress.org/support/users/kdmurthy/)
 * (@kdmurthy)
 * [13 years, 6 months ago](https://wordpress.org/support/topic/error-message-upon-activation/#post-3201412)
 * Can you try the new version (1.2) and see whether it works for you?
 *  [carroc](https://wordpress.org/support/users/carroc/)
 * (@carroc)
 * [13 years, 6 months ago](https://wordpress.org/support/topic/error-message-upon-activation/#post-3201413)
 * I just upgraded to 1.2 and when I activated I ot the “The plugin does not have
   a valid header.” message.
 *  Plugin Author [kdmurthy](https://wordpress.org/support/users/kdmurthy/)
 * (@kdmurthy)
 * [13 years, 6 months ago](https://wordpress.org/support/topic/error-message-upon-activation/#post-3201414)
 * Could you solve this issue?
 *  [carroc](https://wordpress.org/support/users/carroc/)
 * (@carroc)
 * [13 years, 6 months ago](https://wordpress.org/support/topic/error-message-upon-activation/#post-3201422)
 * When you try to activate the plugin after install you get this error message.
   If I use my back button to go back to the dashboard and go straight to the installed
   plugins page, I can then activate the plugin without error.
 *  [carla_chalmers](https://wordpress.org/support/users/txhorselady/)
 * (@txhorselady)
 * [13 years, 5 months ago](https://wordpress.org/support/topic/error-message-upon-activation/#post-3201431)
 * I am getting the same error
 *  [kisshomaru](https://wordpress.org/support/users/kisshomaru/)
 * (@kisshomaru)
 * [13 years, 5 months ago](https://wordpress.org/support/topic/error-message-upon-activation/#post-3201432)
 * I’m also getting the same error on wp 3.5.
    Also, when installing on 3.5 it does
   not seem to recognize any css. It’s just not formatted in any way (not in the
   wp menus and not in the front end).
 *  Plugin Author [kdmurthy](https://wordpress.org/support/users/kdmurthy/)
 * (@kdmurthy)
 * [13 years, 5 months ago](https://wordpress.org/support/topic/error-message-upon-activation/#post-3201433)
 * Not yet checked with 3.5. Shall post an update in couple of days.
 *  [techxld](https://wordpress.org/support/users/techxld/)
 * (@techxld)
 * [13 years, 3 months ago](https://wordpress.org/support/topic/error-message-upon-activation/#post-3201447)
 * I’m using WP 3.5.1, had the same issue and followed what ‘carroc’ mentioned. 
   Worked for me for my blog [http://www.techxld.com](http://www.techxld.com).
 * **Follow this steps: **
    1. Install the plugin by searching with the name (wordpress
   >plugin>add new) instead of uploading the package. 2. Go through the installation
   process and once it asks for activating it, click ‘Activate’ (I know it will 
   come up with the error). 3. Leave it as is and return to the Plugins page and
   find ‘Schemeable Sliding Panel’ from the list. 3. Click ‘Activate’.
 * This should work. Did for me. Let me know if you find any issue.

Viewing 9 replies - 1 through 9 (of 9 total)

The topic ‘Error message upon activation’ is closed to new replies.

 * ![](https://s.w.org/plugins/geopattern-icon/schemeable-sliding-panel_007f00.svg)
 * [Schemeable Sliding Panel](https://wordpress.org/plugins/schemeable-sliding-panel/)
 * [Frequently Asked Questions](https://wordpress.org/plugins/schemeable-sliding-panel/#faq)
 * [Support Threads](https://wordpress.org/support/plugin/schemeable-sliding-panel/)
 * [Active Topics](https://wordpress.org/support/plugin/schemeable-sliding-panel/active/)
 * [Unresolved Topics](https://wordpress.org/support/plugin/schemeable-sliding-panel/unresolved/)
 * [Reviews](https://wordpress.org/support/plugin/schemeable-sliding-panel/reviews/)

 * 9 replies
 * 6 participants
 * Last reply from: [techxld](https://wordpress.org/support/users/techxld/)
 * Last activity: [13 years, 3 months ago](https://wordpress.org/support/topic/error-message-upon-activation/#post-3201447)
 * Status: not resolved