I was able to connect after a few minutes... maybe it was my connection.
After looking at your files I was able to discover that your WA_eCart/Creations18_PHP.php file was blank. I'm not sure if it was an issue when it was created or uploaded, but I re-created that cart object and uploaded it and that seems to have fixed the problem.
Most likely it was an issue while uploading that file since I think if it wasn't created properly you wouldn't be able to use it for the add to cart in the first place.