This error means WordPress hit the PHP memory limit while processing a request.
It often appears during heavy operations like WooCommerce imports, backups, or page builder rendering.

You can raise the limit by adding define('WP_MEMORY_LIMIT', '256M'); to wp-config.php.

If the error persists, the server-level PHP memory limit is lower and needs to be increased via php.ini or hosting control panel.

The underlying cause is usually inefficient plugins, large queries, or unoptimized WooCommerce extensions. Disabling non-essential plugins and testing again helps narrow it down quickly. One common oversight is increasing WordPress memory but not PHP memory, which makes the change ineffective.
The key takeaway is that memory errors are often symptoms of deeper performance problems, not just low limits.