These are some of the basic WordPress Errors you may experience
<strong>ERR_CONNECTION_TIMED_OUT </strong>— Caused by a slow or overloaded web server.
<strong>ERR_CACHE_MISS</strong> — If you see this, look into your website’s cache or PHP tools like plugins, as they’re very likely the cause.
<strong>500 Internal Server Error</strong> — A serious error that can usually be traced back to server file corruption.
<strong>Error Establishing a Database Connection </strong>— Corruption in your database or a database server issue can be the root of this problem.
<strong>HTTP 503 Service Unavailable</strong> — Indicates an issue with your server.
<strong>HTTP 502 Bad Gateway</strong> — Yet another server issue, often caused by too many visitors overloading it.
You Can solve this issue of Critical error by following these steps:
`Enable Debug in WordPress
Step 1: Connect to your site with FTP.
Step 2: Find wp-config.php in the root folder and open it with a text editor or IDE.
Step 3: Place the following code at the bottom of the document, just before the final message, then save and close the file:
define( ‘WP_DEBUG’, true );
define( ‘WP_DEBUG_DISPLAY’, false );
Roll Back Your Site
Revert to a Default Theme
Disable All Plugins
Raise the PHP Memory Limit