Universal Media Server | Forum

I have no idea. Start by describing your setup, what you're doing on which device and post the debug files as described in red above, and we might be able to help you.

The log is not according to the problem reporting guidelines and is useless. That said, you're using UMS when you don't need its features. If you have the computer connected via HDMI, you can use any media player to play files directly. I'd give Kodi a try.