I guess you are here because you have been locked out of your website. Yeah WordPress does that sometimes. This usually happens after a WordPress plugin update.
Here is how to fix “there has been a critical error on your website” error on your website in — steps
Login To Your Hosting and Find the cPanel
I am using Goddady so you UI might be different. Under Web Hosting select manage and select cPanel Admin.
Navigate to WordPress wp-content
Navigate to WordPress wp-content folder from File Manager.
Depending on your installation, the wp-content folder might be located in the root of public_html.
Rename Plugins Folder
Right click on the plugins folder and rename it to anything other than plugins, I renamed mine plugins_ with an underscore at the end.
Go back to your website. You will notice it now loading correctly but we have the plugins deactivated.
Go back to the cPanel file manager and rename the plugins folder back to plugins.
Go back to your WordPress website and reactivate all your plugins.