Title: Cannot activate plugin 3.4.2
Last modified: August 20, 2016

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# Cannot activate plugin 3.4.2

 *  [daevid](https://wordpress.org/support/users/daevid/)
 * (@daevid)
 * [13 years, 4 months ago](https://wordpress.org/support/topic/cannot-activate-plugin-342/)
 * When activating plugin following PHP errors occur. There is no direct “has_cap”
   call in the plugin code though.
 *     ```
       Notice: has_cap was called with an argument that is deprecated since version 2.0! Usage of user levels by plugins and themes is deprecated. Use roles and capabilities instead. in /Applications/XAMPP/xamppfiles/htdocs/foo/wordpress/wp-includes/functions.php on line 2722
   
       Warning: Cannot modify header information - headers already sent by (output started at /Applications/XAMPP/xamppfiles/htdocs/foo/wordpress/wp-includes/functions.php:2722) in /Applications/XAMPP/xamppfiles/htdocs/foo/wordpress/wp-includes/option.php on line 563
   
       Warning: Cannot modify header information - headers already sent by (output started at /Applications/XAMPP/xamppfiles/htdocs/foo/wordpress/wp-includes/functions.php:2722) in /Applications/XAMPP/xamppfiles/htdocs/foo/wordpress/wp-includes/option.php on line 564
       ```
   
 * [http://wordpress.org/extend/plugins/flickrapi/](http://wordpress.org/extend/plugins/flickrapi/)

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 * 0 replies
 * 1 participant
 * Last reply from: [daevid](https://wordpress.org/support/users/daevid/)
 * Last activity: [13 years, 4 months ago](https://wordpress.org/support/topic/cannot-activate-plugin-342/)
 * Status: not resolved