Hey weeto,I'm getting a similar error, but using the music player that only functions within the app. It happens after I do the following:Have a song playing with no songs in the queueCall prepend() with a song so that the queue has just the oneSkip the currently playing song (has to be skipped, if the song ends normally there is no issue)When I try to use prepend() again after the skip(to always keep one song in the queue), the error is thrown. This is all in the foreground, so perhaps that isn't the issue. Error message:[SDKPlayback] -[MPMusicPlayerController prependQueueDescriptor] completed id=applicationMusicPlayer error: Error Domain=MPCPlayerRequestErrorDomain Code=1000 "Failed to send command 125" UserInfo={NSDebugDescription=Failed to send command 125, NSUnderlyingError=0x282c008a0 {Error Domain=MPCPlayerRequestErrorDomain Code=1000 "Failed to send command 125 (MRSendCommandError = 7)" UserInfo={NSDebugDescription=Failed to send command 125 (MRSendCommandError = 7)}}}The underlying error and MRSendCommandError are different, but yours is the most similar error message I've found on the forums so I wanted to check in and see if you'd figured anything out with this. Also, is there documentation on the command error codes anywhere? That could potentially help identify the issues. Thanks