This thread has been moved to the "Developing server-side applications in Dreamweaver" forum.
That's a WordPress site that you're trying to view. You can load a WordPress site only through the index.php file in the site root. There are many files in WordPress that use the name index.php. Are you accessing the correct one? Also, have you defined the site correctly in Dreamweaver?
Can you view the WordPress site normally in your localhost by loading the index.php page directly into a browser?