Errors when I try to send an email from the admin, after changing hosts

I just transfered all of my clients zencarts over to hostgater. I uploaded the latest versions of Zencart - did a database upgrade. Problem is all of my zencarts (10 of them) give the following error when I try to send an email from the admin. Can somebody give me some insight into this issue.

WARNING: An Error occurred, please refresh the page and try again.
Is there something with Hostgator I need to have them do.

Look in the /cache directory to see what the debug logs read to help locate the error(s) ...

Thanks, I will try that.
The strange thing is, it isn't giving me a traditional error.

Send Email To Customers
WARNING: An Error occurred, please refresh the page and try again.

It isn't giving me a traditional php error, like you would expect.

This is what my cache says and it looks like an error in the zen cart code.
does anybody know how to fix this

PHP Warning: constant() [<a href='function.constant'>function.constant</a>]: Couldn't find constant TABLE_SUBSCRIBERS in /public_html/includes/functions/audience.php on line 113
[14-Jun-2012 20:55:18] 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

When you moved, did you not install a mod that was on the old install? Check this thread:

http://www.zen-cart.com/showthread.php?128531-Warning-constant%28%29-Couldn-t-find-constant-TABLE_SUBSCRIBERS-in&highlight=Couldn%27t+find+constant+TABLE_SUBSCRIBERS

That's right. Your site is expecting the old Newsletter Subscribe mod, but you're missing files which it requires.