Fatal error: Cannot declare class WP_REST_Blocks_Controller, because the name is already in use in /app/public/wp-content/plugins/gutenberg/lib/class-wp-rest-blocks-controller.php on line 0

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Hi there, I’m rather new to Local by Flywheel. A few months ago I created a test website, as a part of a Udemy online training about developing websites using Wordpress. I started Local by Flywheel again yesterday and it prompted some updates. I executed all the updates and now when I try to start the website or the admin console, I get the following error message:
Fatal error: Cannot declare class WP_REST_Blocks_Controller, because the name is already in use in /app/public/wp-content/plugins/gutenberg/lib/class-wp-rest-blocks-controller.php on line 0

How can I solve this?

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The newest version of WordPress (v5.0 and greater) include Gutenberg in the core, so you won’t need the Gutenberg plugin. I would delete the Gutenberg plugin folder and then run updates

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Removing the Gutenberg folder indeed has solved the problem. Thanks very much!

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