Cannot send email to customer within admin. WARNING: An Error occurred, please refre

Cannot send email to customer within admin. This is what I get:

WARNING: An Error occurred, please refresh the page and try again.

MagicMan:

Cannot send email to customer within admin. This is what I get:

WARNING: An Error occurred, please refresh the page and try again.

Did you check the log files? If there is an entry relating to this error pls post it here.

MagicMan:

WARNING: An Error occurred, please refresh the page and try again.
FAQ on that topic: http://www.zen-cart.com/content.php?311-warning-an-error-occurred-please-refresh-the-page-and-try-again

This is what the log file says.

[26-Jun-2015 09:13:39] PHP Warning: constant() [<a href='function.constant'>function.constant</a>]: Couldn't find constant TABLE_SUBSCRIBERS in /home/123-XYZ/public_html/store/includes/functions/audience.php on line 113
[26-Jun-2015 09:13:39] PHP Fatal error: 1064:You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'as s left join customers as c on c.customers_id = s.customers_id' at line 1 :: select c.customers_firstname, c.customers_lastname, s.email_address as customers_email_address from as s left join customers as c on c.customers_id = s.customers_id in /home/123-XYZ/public_html/store/includes/classes/db/mysql/query_factory.php on line 120

That tells me you once installed the "Newsletter Subscribe" addon, which alters the queries in the query_builder database table, but now you've removed the PHP files for the Newsletter Subscribe addon, but haven't put back the original query_builder database table records.