You've renamed the svmanager folder to thebottlebutleratlanta – yes? Nothing wrong with that – I'm just checking if I understand your setup.
The message is saying that svmanager.php is looking for a file thebottlebutleratlanta\includes\constants.php and it's not finding it. So either it's not there or the server permissions are not allowing svManager to find it.
Please check if all the files in the svManager distribution are actually inside your thebottlebutleratlanta folder.
If all the files are there then check if svManager has read and write permissions on the thebottlebutleratlanta folder.
SimpleViewer Support Team.