Or what ^ SHE said...
Hello,
I believe all you have to do is make sure that the email address in the zp-config.php file is correct:
Lines 54-55
// The email for the admin user. Used to send notification emails.
$conf['admin_email'] = "yourname@domain.com";
If it's not correct, or if your server doesn't use a standard set up for email, then you will get this message. If that doesn't fix it, or if the email is correct, many times the the full server path in the zp-config file on lines 112-113 will fix it:
Uncomment them and write the path as it is for your situation (you will need to check your host knowledge base or faqs or call them)
// define('WEBPATH', '/zenphoto');
// define('SERVERPATH', '/full/server/path/to/zenphoto');
Usually its something like this (but you need to check with YOUR host):
/home/~username/public_html/SUBDOMAIN/
Let us know.