The error message suggests that you did not upload the file or a path problem.
If that is not the problem, I would suggest you provide a little more information. Post the code to your connection script (remove UN and PW), also post your queries, perhaps someone would be able to see where you have gone astray.
2) The testing server specified for this site does not map to the http://www.oneforestfilms.com/_mmServerScripts/MMHTTPDB.php URL. Verify that the URL Prefix maps to the root of the site.
Dreamweaver relies on two files in a hidden folder called _mmServerScripts to communicate with the MySQL database. That error message is telling you that Dreamweaver can't find MMHTTPDB.php in the expected location. That's why it can't communicate with the database.
On some remote servers, Dreamweaver can't create the _mmServerScripts folder because of permissions.
Use your remote server's control panel to see if the _mmServerScripts folder has been created (it's hidden only in Dreamweaver's Files panel). If it hasn't, you need to create it and upload MMHTTPDB.php and mysql.php. You can create copies of those files by defining a local testing server.
The other possibility is that _mmServerScripts isn't in the root of oneforestfilms.com. If that's the case, the URL Prefix in your server definition is wrong, and needs to be corrected.