Title: Fatal Errors on Activation
Last modified: August 21, 2016

---

# Fatal Errors on Activation

 *  [KTS915](https://wordpress.org/support/users/kts915/)
 * (@kts915)
 * [11 years, 11 months ago](https://wordpress.org/support/topic/fatal-errors-on-activation/)
 * On trying to activate this plugin, it produces a fatal error:
    `Fatal error: 
   Cannot redeclare custom_upload_mimes()`
 * After deactivating the plugin that has already declared `custom_upload_mimes()`,
   and then trying again, I get:
    `Fatal error: Cannot redeclare register_mysettings()`
 * Thankfully, if I deactivate the plugin that has already declared `register_mysettings()`,
   this plugin activates successfully.
 * Please could you add some code to check whether these two declarations have already
   been made?
 * [https://wordpress.org/plugins/wp-team-manager/](https://wordpress.org/plugins/wp-team-manager/)

The topic ‘Fatal Errors on Activation’ is closed to new replies.

 * ![](https://ps.w.org/wp-team-manager/assets/icon-256x256.png?rev=3255850)
 * [Dynamic Team Manager - Team Member Showcase with grid, slider, table Elementor widget & shortcode](https://wordpress.org/plugins/wp-team-manager/)
 * [Frequently Asked Questions](https://wordpress.org/plugins/wp-team-manager/#faq)
 * [Support Threads](https://wordpress.org/support/plugin/wp-team-manager/)
 * [Active Topics](https://wordpress.org/support/plugin/wp-team-manager/active/)
 * [Unresolved Topics](https://wordpress.org/support/plugin/wp-team-manager/unresolved/)
 * [Reviews](https://wordpress.org/support/plugin/wp-team-manager/reviews/)

 * 0 replies
 * 1 participant
 * Last reply from: [KTS915](https://wordpress.org/support/users/kts915/)
 * Last activity: [11 years, 11 months ago](https://wordpress.org/support/topic/fatal-errors-on-activation/)
 * Status: not resolved