DOSBox Pure Core in Retroarch produces Roland MPU-401 error.

[SiriusVI87]

Hey everyone,

I was trying to Launch Alice's Adventures in Wonderland with DOSBox Pure in Retroarch. I am using the dosbox.conf file to launch the game via Launchbox. Everything seems to work fine, including the audio. However, I get this MPU-401 driver error in the beginning. If I just hit OK, I can hear the audio playing, so I don't know what this error means.

Can anyone tell me what I have to do to get rid of it? The error does not appear if I use the eXoWin3x version of the game, however, I'd like to use overlays, shaders and save states, that's why I want to use the DOSXBox Pure Retroarch Core.