Migration and Index of

Hello,

I migrate my site olddomain.com from an account to another account with the same domain: olddomain.com but the install now is in a folder from another domain. http://www.newdomain.com/wordpress

but i put my domain pointing to that address. and it looks like the same site and domain. when you enter olddomain.com shuld be appears the web but instance says index of and i can’t enter to admin.

What is wrong?