Title: Cannot Activate Plugin, Please Help
Last modified: August 21, 2016

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# Cannot Activate Plugin, Please Help

 *  [amuschette](https://wordpress.org/support/users/amuschette/)
 * (@amuschette)
 * [12 years, 6 months ago](https://wordpress.org/support/topic/cannot-activate-plugin-please-help/)
 * I am able to download the plugin, but when I try to activate it, I receive this
   message:
 * Plugin could not be activated because it triggered a fatal error.
 * Fatal error: Cannot redeclare upgrade_all() (previously declared in /homepages/
   13/d376116902/htdocs/wordpress-3.3/wordpress-Backup/wp-admin/includes/upgrade.
   php:331) in /homepages/13/d376116902/htdocs/wordpress-3.3/wordpress-Backup/wp-
   admin/includes/upgrade.php on line 414
 * How can I fix this issue?
 * Please advise. Thank you!
 * [http://wordpress.org/plugins/double-opt-in-for-download/](http://wordpress.org/plugins/double-opt-in-for-download/)

The topic ‘Cannot Activate Plugin, Please Help’ is closed to new replies.

 * ![](https://s.w.org/plugins/geopattern-icon/double-opt-in-for-download_676167.
   svg)
 * [Double Opt-In for Download](https://wordpress.org/plugins/double-opt-in-for-download/)
 * [Frequently Asked Questions](https://wordpress.org/plugins/double-opt-in-for-download/#faq)
 * [Support Threads](https://wordpress.org/support/plugin/double-opt-in-for-download/)
 * [Active Topics](https://wordpress.org/support/plugin/double-opt-in-for-download/active/)
 * [Unresolved Topics](https://wordpress.org/support/plugin/double-opt-in-for-download/unresolved/)
 * [Reviews](https://wordpress.org/support/plugin/double-opt-in-for-download/reviews/)

## Tags

 * [double opt-in](https://wordpress.org/support/topic-tag/double-opt-in/)

 * 0 replies
 * 1 participant
 * Last reply from: [amuschette](https://wordpress.org/support/users/amuschette/)
 * Last activity: [12 years, 6 months ago](https://wordpress.org/support/topic/cannot-activate-plugin-please-help/)
 * Status: not a support question