Title: Fatal error: Uncaught Error: Undefined constant “WP_DEVELOPMENT_MODE”
Last modified: October 10, 2023

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# Fatal error: Uncaught Error: Undefined constant “WP_DEVELOPMENT_MODE”

 *  [uhtredkhan](https://wordpress.org/support/users/uhtredkhan/)
 * (@uhtredkhan)
 * [2 years, 8 months ago](https://wordpress.org/support/topic/fatal-error-uncaught-error-undefined-constant-wp_development_mode/)
 * help guys
    -  This topic was modified 2 years, 8 months ago by [uhtredkhan](https://wordpress.org/support/users/uhtredkhan/).
 * The page I need help with: _[[log in](https://login.wordpress.org/?redirect_to=https%3A%2F%2Fwordpress.org%2Fsupport%2Ftopic%2Ffatal-error-uncaught-error-undefined-constant-wp_development_mode%2F%3Foutput_format%3Dmd&locale=en_US)
   to see the link]_

The topic ‘Fatal error: Uncaught Error: Undefined constant “WP_DEVELOPMENT_MODE”’
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 * Last reply from: [uhtredkhan](https://wordpress.org/support/users/uhtredkhan/)
 * Last activity: [2 years, 8 months ago](https://wordpress.org/support/topic/fatal-error-uncaught-error-undefined-constant-wp_development_mode/)
 * Status: not resolved