Title: Error messages when activating plugin
Last modified: August 21, 2016

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# Error messages when activating plugin

 *  [Christine Cobb](https://wordpress.org/support/users/chriscobb/)
 * (@chriscobb)
 * [12 years, 9 months ago](https://wordpress.org/support/topic/error-messages-when-activating-plugin-2/)
 * Here are the messages:
    ‘Warning: array_key_exists() [function.array-key-exists]:
   The second argument should be either an array or an object in /…wp-content/plugins/
   simple-content-reveal/includes/acr-set-defaults.php on line 20
 * Warning: session_start() [function.session-start]: Cannot send session cache 
   limiter – headers already sent (output started at /…/wp-content/plugins/simple-
   content-reveal/includes/acr-set-defaults.php:20) in /…/wp-content/plugins/testimonials-
   widget-premium/testimonials-widget-premium.php on line 73′
 * Looks like there is a conflict with the Testimonials Widget Plugin.
 * [http://wordpress.org/plugins/simple-content-reveal/](http://wordpress.org/plugins/simple-content-reveal/)

The topic ‘Error messages when activating plugin’ is closed to new replies.

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 * [Content Reveal](https://wordpress.org/plugins/simple-content-reveal/)
 * [Frequently Asked Questions](https://wordpress.org/plugins/simple-content-reveal/#faq)
 * [Support Threads](https://wordpress.org/support/plugin/simple-content-reveal/)
 * [Active Topics](https://wordpress.org/support/plugin/simple-content-reveal/active/)
 * [Unresolved Topics](https://wordpress.org/support/plugin/simple-content-reveal/unresolved/)
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 * 0 replies
 * 1 participant
 * Last reply from: [Christine Cobb](https://wordpress.org/support/users/chriscobb/)
 * Last activity: [12 years, 9 months ago](https://wordpress.org/support/topic/error-messages-when-activating-plugin-2/)
 * Status: not resolved