Title: problems to activate plugin
Last modified: August 21, 2016

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# problems to activate plugin

 *  [Mcruta](https://wordpress.org/support/users/mcruta/)
 * (@mcruta)
 * [13 years ago](https://wordpress.org/support/topic/problems-to-activate-plugin/)
 * I installed this pugin but when I will activate it message is saying: Cannot 
   modify header information ……
 * What is this all about?
 * [http://wordpress.org/extend/plugins/my-custom-css/](http://wordpress.org/extend/plugins/my-custom-css/)

The topic ‘problems to activate plugin’ is closed to new replies.

 * ![](https://s.w.org/plugins/geopattern-icon/my-custom-css_5e56b8.svg)
 * [My Custom CSS PHP & ADS](https://wordpress.org/plugins/my-custom-css/)
 * [Support Threads](https://wordpress.org/support/plugin/my-custom-css/)
 * [Active Topics](https://wordpress.org/support/plugin/my-custom-css/active/)
 * [Unresolved Topics](https://wordpress.org/support/plugin/my-custom-css/unresolved/)
 * [Reviews](https://wordpress.org/support/plugin/my-custom-css/reviews/)

 * 0 replies
 * 1 participant
 * Last reply from: [Mcruta](https://wordpress.org/support/users/mcruta/)
 * Last activity: [13 years ago](https://wordpress.org/support/topic/problems-to-activate-plugin/)
 * Status: not resolved