Title: Error Activating Plugin
Last modified: August 20, 2016

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# Error Activating Plugin

 *  Resolved [Siriusphil](https://wordpress.org/support/users/siriusphil/)
 * (@siriusphil)
 * [13 years, 4 months ago](https://wordpress.org/support/topic/error-activating-plugin-2/)
 * Cannot activate the plug-in. I receive the following error:
 * Plugin could not be activated because it triggered a fatal error.
 * Fatal error: Cannot redeclare mb_substr() (previously declared in /data/disk01/
   websites/mywebsite.org/wp-includes/compat.php:17) in /data/disk01/websites/mywebsite.
   org/wp-content/plugins/rating-widget/rating-widget.php on line 4640
 * [http://wordpress.org/extend/plugins/rating-widget/](http://wordpress.org/extend/plugins/rating-widget/)

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

 *  Plugin Author [Vova Feldman](https://wordpress.org/support/users/svovaf/)
 * (@svovaf)
 * [13 years, 4 months ago](https://wordpress.org/support/topic/error-activating-plugin-2/#post-3368944)
 * We’ll fix this issue for the next release. In the meanwhile, you can simply open
   the file `wp-content/plugins/rating-widget/rating-widget.php` and delete line
   number 4640.
 * It’s very strange situation, seems like your PHP libs don’t include `mb_strlen`
   but include `mb_substr` which are both functions of the same library.
 *  Plugin Author [Vova Feldman](https://wordpress.org/support/users/svovaf/)
 * (@svovaf)
 * [13 years, 4 months ago](https://wordpress.org/support/topic/error-activating-plugin-2/#post-3369066)
 * Fixed in the version 1.6.9

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

The topic ‘Error Activating Plugin’ is closed to new replies.

 * ![](https://s.w.org/plugins/geopattern-icon/rating-widget_4db0e0.svg)
 * [Rating-Widget: Star Review System](https://wordpress.org/plugins/rating-widget/)
 * [Frequently Asked Questions](https://wordpress.org/plugins/rating-widget/#faq)
 * [Support Threads](https://wordpress.org/support/plugin/rating-widget/)
 * [Active Topics](https://wordpress.org/support/plugin/rating-widget/active/)
 * [Unresolved Topics](https://wordpress.org/support/plugin/rating-widget/unresolved/)
 * [Reviews](https://wordpress.org/support/plugin/rating-widget/reviews/)

 * 2 replies
 * 2 participants
 * Last reply from: [Vova Feldman](https://wordpress.org/support/users/svovaf/)
 * Last activity: [13 years, 4 months ago](https://wordpress.org/support/topic/error-activating-plugin-2/#post-3369066)
 * Status: resolved