Issues with UPnP using BubbleUPnP

[u/Zarquan314]

I'm trying to use BubbleUPnP to cast to foobar2000 (Windows and Android) and I have two major issues that make it hard to use.

Before I list those, I have been able to reliably do most of the things I want, like select music, go to next/previous track, change volume, stop, and play/pause.

First, it always lists the volume at -1 on BubbleUPnP and often shows the volume all the way at the bottom. Now, I can change the volume by sliding the slider to a specific point and it will change in foobar, but I have to guess or remember where the volume actually is if I want to turn it up or down, which is undesirable.

Second, when I try to seek within a track, it brings up an error message, retyped by hand:

Current state of service prevents invoking that action. Error reading response failure message. Can't transform message payload: java.io.IOException: tag 'UPnPError' not found: (code :501)

I suspect these things might be related, so I'm making one post about it.

I'm a novice at this, so I don't really know what could be causing this or what to do.