Hi, I reinstalled the module but the problem persists, i.e. during checkout, I received the following error message.
"The page isn't redirecting properly. Firefox has detected that the server is redirecting the request for this address in a way that will never complete."

Sure, then provide me a link to the installation site and I will take a look. Turn one-page checkout on. Is there a difference between on and off?
The link is located at https://www.dealbyethan.com/checkout.html . This page shows up when someone hits checkout. The one-page checkout is on. I found out that one-page checkout was left as false in the Admin > Configuration. So the one-page checkout does only have one step. But what about the error message I keep getting during checkout? Why isn't the page redirecting properly? I did everything very carefully this time according to your instructions.