Title: Plugin activation warning
Last modified: September 1, 2016

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# Plugin activation warning

 *  Resolved [Luke Cavanagh](https://wordpress.org/support/users/lukecavanagh/)
 * (@lukecavanagh)
 * [9 years, 10 months ago](https://wordpress.org/support/topic/plugin-activation-warning-1/)
 * The plugin when activated gives the following error message.
 * The plugin generated 1 characters of unexpected output during activation. If 
   you notice “headers already sent” messages, problems with syndication feeds or
   other issues, try deactivating or removing this plugin.
 * [https://wordpress.org/plugins/wp-theme-optimizer/](https://wordpress.org/plugins/wp-theme-optimizer/)

Viewing 2 replies - 1 through 2 (of 2 total)

 *  Plugin Author [d](https://wordpress.org/support/users/dsgnr/)
 * (@dsgnr)
 * [9 years, 9 months ago](https://wordpress.org/support/topic/plugin-activation-warning-1/#post-7623915)
 * Thank you Luke.
 * This has now been resolved.
 *  Thread Starter [Luke Cavanagh](https://wordpress.org/support/users/lukecavanagh/)
 * (@lukecavanagh)
 * [9 years, 9 months ago](https://wordpress.org/support/topic/plugin-activation-warning-1/#post-7623916)
 * [@daniel](https://wordpress.org/support/users/daniel/) Hand
 * Thanks.

Viewing 2 replies - 1 through 2 (of 2 total)

The topic ‘Plugin activation warning’ is closed to new replies.

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## Tags

 * [already](https://wordpress.org/support/topic-tag/already/)
 * [headers](https://wordpress.org/support/topic-tag/headers/)
 * [sent](https://wordpress.org/support/topic-tag/sent/)

 * 2 replies
 * 2 participants
 * Last reply from: [Luke Cavanagh](https://wordpress.org/support/users/lukecavanagh/)
 * Last activity: [9 years, 9 months ago](https://wordpress.org/support/topic/plugin-activation-warning-1/#post-7623916)
 * Status: resolved