Wordpress admin panel is not working

[Greenreader9]

Follow this guide then:

Installation failed: There has been a critical error on your website

WordPress supports installing and updating plugins and themes from the official store right through the WordPress admin interface. However, after trying to install or update a large plugin (like WooCommerce) or theme, you may encounter an error like this: Installation failed: There has been a critical error on your website. Please check your site admin email inbox for instructions. Learn more about debugging in WordPress. This error means that the installation process crashed, and may have l…