hass-music-assistant: Playback not working on Kodi/OSMC

I have a whole-house audio system using OSMC - It is showing up as player in Home Assistant, and I can control it from there (i.e. pause playback once it is playing). However, music assistant does not actually start playback on OSMC. The OSMC is online and fully functional.

Whenever I try to play something from music assistant to OSMC, I see this in the logs:

2022-06-16 10:08:59 ERROR (MainThread) [aiohttp.server] Error handling request
Traceback (most recent call last):
File "/usr/local/lib/python3.9/site-packages/aiohttp/web_protocol.py", line 435, in _handle_request
resp = await request_handler(request)
File "/usr/local/lib/python3.9/site-packages/aiohttp/web_app.py", line 504, in _handle
resp = await handler(request)
File "/usr/local/lib/python3.9/site-packages/music_assistant/controllers/streams.py", line 160, in serve_queue_stream
await queue_stream.subscribe(client_id, resp.write)
File "/usr/local/lib/python3.9/site-packages/music_assistant/controllers/streams.py", line 311, in subscribe
assert not self.done.is_set(), "Stream task is already finished"
AssertionError: Stream task is already finished
2022-06-16 10:09:00 ERROR (MainThread) [aiohttp.server] Error handling request
Traceback (most recent call last):
File "/usr/local/lib/python3.9/site-packages/aiohttp/web_protocol.py", line 435, in _handle_request
resp = await request_handler(request)
File "/usr/local/lib/python3.9/site-packages/aiohttp/web_app.py", line 504, in _handle
resp = await handler(request)
File "/usr/local/lib/python3.9/site-packages/music_assistant/controllers/streams.py", line 160, in serve_queue_stream
await queue_stream.subscribe(client_id, resp.write)
File "/usr/local/lib/python3.9/site-packages/music_assistant/controllers/streams.py", line 311, in subscribe
assert not self.done.is_set(), "Stream task is already finished"
AssertionError: Stream task is already finished
2022-06-16 10:09:00 ERROR (MainThread) [aiohttp.server] Error handling request
Traceback (most recent call last):
File "/usr/local/lib/python3.9/site-packages/aiohttp/web_protocol.py", line 435, in _handle_request
resp = await request_handler(request)
File "/usr/local/lib/python3.9/site-packages/aiohttp/web_app.py", line 504, in _handle
resp = await handler(request)
File "/usr/local/lib/python3.9/site-packages/music_assistant/controllers/streams.py", line 160, in serve_queue_stream
await queue_stream.subscribe(client_id, resp.write)
File "/usr/local/lib/python3.9/site-packages/music_assistant/controllers/streams.py", line 311, in subscribe
assert not self.done.is_set(), "Stream task is already finished"
AssertionError: Stream task is already finished
2022-06-16 10:09:00 ERROR (MainThread) [aiohttp.server] Error handling request
Traceback (most recent call last):
File "/usr/local/lib/python3.9/site-packages/aiohttp/web_protocol.py", line 435, in _handle_request
resp = await request_handler(request)
File "/usr/local/lib/python3.9/site-packages/aiohttp/web_app.py", line 504, in _handle
resp = await handler(request)
File "/usr/local/lib/python3.9/site-packages/music_assistant/controllers/streams.py", line 160, in serve_queue_stream
await queue_stream.subscribe(client_id, resp.write)
File "/usr/local/lib/python3.9/site-packages/music_assistant/controllers/streams.py", line 311, in subscribe
assert not self.done.is_set(), "Stream task is already finished"
AssertionError: Stream task is already finished

and

2022-06-16 10:03:03 ERROR (MainThread) [homeassistant.components.kodi.media_player] Error calling async_update on entity media_player.osmc: TransportError("Error calling method 'Player.GetActivePlayers': Transport Error", TimeoutError())
2022-06-16 10:03:17 ERROR (MainThread) [homeassistant.components.kodi.media_player] Error calling async_update on entity media_player.osmc: TransportError("Error calling method 'Player.GetActivePlayers': Transport Error", ClientConnectorError(ConnectionKey(host='192.168.1.49', port=80, is_ssl=False, ssl=None, proxy=None, proxy_auth=None, proxy_headers_hash=1996882747), ConnectionRefusedError(111, "Connect call failed ('192.168.1.49', 80)")))

is this supposed to work? anything I can do to help?