Tested it on 1.6, it worked fine first, and I was able to access the module settings in the backend, but unfortunately, I was not able to access the backend once I signed out, getting the 500 error when trying to sign in again. The front end was working fine. I was only able to sign in again when I removed the module folder from the hosting account. I also tested an older version of the module and encountered the same problem. So I think there may be some conflicts with one of my existing modules.