OS X Server - Device enrollment returns 500 Error?

I'm currently working with OS X Server (Yosemite) to try and create profiles for certain devices. It appears that I have configured the server correctly, and I have assigned a domain to it. When I try to enroll an iOS device and click "Enroll", I get a 500 Internal Server Error. Same thing happens on the Mac.

Is this a common issue, or is there something I forgot to configure? Let me know if you need more details...thank you!