The constant “COOKIE_DOMAIN” is defined (probably in wp-config.php).

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I’ve following the instructions in the sticky post to set up domain mapping with a plugin.

However, I receive the error:

The constant “COOKIE_DOMAIN” is defined (probably in wp-config.php). Please remove or comment out that define() line.

In wp-config.php, I have the following:

define('COOKIE_DOMAIN', $_SERVER[ ‘HTTP_HOST’ ] );

as defined in the sticky post.

What do I do?

Thanks,
Steve