Title: Cannot install plugin!?
Last modified: August 24, 2016

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# Cannot install plugin!?

 *  Resolved [cosgrove247](https://wordpress.org/support/users/cosgrove247/)
 * (@cosgrove247)
 * [11 years ago](https://wordpress.org/support/topic/cannot-install-plugin-7/)
 * Whenever i try to install cathify, i get these error messages:
 * > Warning: Creating default object from empty value in /var/www/web1338/html/
   > wordpress/wp-content/plugins/revslider/inc_php/framework/update.class.php on
   > line 35
   > Warning: Cannot modify header information – headers already sent by (output
   > started at /var/www/web1338/html/wordpress/wp-content/plugins/revslider/inc_php/
   > framework/update.class.php:35) in /var/www/web1338/html/wordpress/wp-includes/
   > pluggable.php on line 1196
   > Warning: Cannot modify header information – headers already sent by (output
   > started at /var/www/web1338/html/wordpress/wp-content/plugins/revslider/inc_php/
   > framework/update.class.php:35) in /var/www/web1338/html/wordpress/wp-includes/
   > pluggable.php on line 1196
 * Is catchify in conflict with the revolution slider or with the theme?
 * Thanks!
 * [https://wordpress.org/plugins/cachify/](https://wordpress.org/plugins/cachify/)

Viewing 1 replies (of 1 total)

 *  Anonymous User 7658014
 * (@anonymized_7658014)
 * [10 years, 11 months ago](https://wordpress.org/support/topic/cannot-install-plugin-7/#post-6171975)
 * Those warning messages obviously indicate an issue with the Revolution Slider
   plugin an Cachify. You can try disabling Revolution Slider and check if Cachify
   works as expected. You could also seek support for Revolution Slider and try 
   to debug what exactly goes wrong in _inc\_php/framework/update.class.php_ on 
   line 35.

Viewing 1 replies (of 1 total)

The topic ‘Cannot install plugin!?’ is closed to new replies.

 * ![](https://ps.w.org/cachify/assets/icon-256x256.png?rev=2505413)
 * [Cachify](https://wordpress.org/plugins/cachify/)
 * [Frequently Asked Questions](https://wordpress.org/plugins/cachify/#faq)
 * [Support Threads](https://wordpress.org/support/plugin/cachify/)
 * [Active Topics](https://wordpress.org/support/plugin/cachify/active/)
 * [Unresolved Topics](https://wordpress.org/support/plugin/cachify/unresolved/)
 * [Reviews](https://wordpress.org/support/plugin/cachify/reviews/)

## Tags

 * [error messages](https://wordpress.org/support/topic-tag/error-messages/)

 * 1 reply
 * 2 participants
 * Last reply from: Anonymous User 7658014
 * Last activity: [10 years, 11 months ago](https://wordpress.org/support/topic/cannot-install-plugin-7/#post-6171975)
 * Status: resolved