Title: WordPress Error – Controller.php
Last modified: June 3, 2025

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# WordPress Error – Controller.php

 *  Resolved [socialdream](https://wordpress.org/support/users/socialdream/)
 * (@socialdream)
 * [11 months, 3 weeks ago](https://wordpress.org/support/topic/wordpress-error-controller-php/)
 * I am encountering an ‘Uncaught Error: Cannot instantiate interface’ on all the
   WordPress sites I administer. Additionally, I am seeing various other PHP errors
   across these sites.
 * Please advise on the necessary steps I should take to diagnose and resolve these
   issues.

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

 *  [vadimcleantalk](https://wordpress.org/support/users/usr1/)
 * (@usr1)
 * [11 months, 3 weeks ago](https://wordpress.org/support/topic/wordpress-error-controller-php/#post-18495054)
 * Hello [@socialdream](https://wordpress.org/support/users/socialdream/)
 * The error _“Uncaught Error: Cannot instantiate interface”_ usually means there’s
   a conflict with a plugin or a corrupted update. To help us investigate this issue
   further, could you please let us know, which PHP version your sites are running
   on?
 *  Plugin Support [sergecleantalk](https://wordpress.org/support/users/sergecleantalk/)
 * (@sergecleantalk)
 * [11 months, 1 week ago](https://wordpress.org/support/topic/wordpress-error-controller-php/#post-18520603)
 * Hello.
   We haven’t heard back from you in a few days, so I’m going to mark this
   topic as “resolved”.If you have any further questions, you can start a new topic
   or contact us via our private Ticket System: [https://cleantalk.org/my/support/open](https://cleantalk.org/my/support/open).

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

The topic ‘WordPress Error – Controller.php’ is closed to new replies.

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## Tags

 * [controller](https://wordpress.org/support/topic-tag/controller/)
 * [php](https://wordpress.org/support/topic-tag/php/)

 * 2 replies
 * 3 participants
 * Last reply from: [sergecleantalk](https://wordpress.org/support/users/sergecleantalk/)
 * Last activity: [11 months, 1 week ago](https://wordpress.org/support/topic/wordpress-error-controller-php/#post-18520603)
 * Status: resolved