IOS error: Media stream has no audio tracks createMediaStreamSource - ios

Question

I tried to mix remote audio tracks in one track and replace my local stream but I got the following error
InvalidStateError: Media stream has no audio tracks createMediaStreamSource
Note: This happen in IOS and I used sipjs, angular , Ionic, and IOSRTC
async mixNWayCall(nawayCall: NWayCall) {
var receivedTracks = [];
nawayCall.lines.forEach((line: Line) => {
if (line !== null && line !== undefined) {
const sessionDescriptionHandler = line.sipSession.sessionDescriptionHandler;
if (!(sessionDescriptionHandler instanceof Web.SessionDescriptionHandler)) {
throw new Error("Session's session description handler not instance of SessionDescriptionHandler.");
}
const peerConnection = sessionDescriptionHandler.peerConnection;
if (!peerConnection) {
throw new Error("Peer connection closed.");
}
peerConnection.getReceivers().forEach((receiver) => {
if (receiver.track) {
receivedTracks.push(receiver.track);
}
});
}
});
let context = new AudioContext();
let allReceivedMediaStreams = new MediaStream();
nawayCall.lines.forEach((line: Line) => {
if (line !== null && line !== undefined) {
let mixedOutput = context.createMediaStreamDestination();
const sessionDescriptionHandler = line.sipSession.sessionDescriptionHandler;
if (!(sessionDescriptionHandler instanceof Web.SessionDescriptionHandler)) {
throw new Error("Session's session description handler not instance of SessionDescriptionHandler.");
}
const senderPeerConnection = sessionDescriptionHandler.peerConnection;
if (!senderPeerConnection) { throw new Error("Peer connection closed."); }
senderPeerConnection.getReceivers().forEach((receiver) => {
receivedTracks.forEach((track) => {
allReceivedMediaStreams.addTrack(receiver.track);
console.log(receiver.track.id, ' receiver.track.id');
console.log(track.id, ' track.id');
if (receiver.track.id !== track.id) {
var sourceStream = context.createMediaStreamSource(new MediaStream([track]));
sourceStream.connect(mixedOutput);
}
});
});
senderPeerConnection.getSenders().forEach((sender) => {
nawayCall.mergeTracks.push(sender.track);
let senderSourceStream = context.createMediaStreamSource(new MediaStream([sender.track]));
senderSourceStream.connect(mixedOutput);
sender.replaceTrack(mixedOutput.stream.getTracks()[0])
});
senderPeerConnection.getSenders()[0].replaceTrack(mixedOutput.stream.getTracks()[0]);
}
});
nawayCall.lines.forEach(async (line: Line) => {
if (line.held) await this.lineService.onResume(line.id, true);
});
nawayCall.held = false;
if (nawayCall.media.mute)
await this.lineService.onNWayCallUnmute(nawayCall.id);
}
}
from the code in the description I got an error that no audio tracks and
I expected to mix audio tracks in one audio track then merge the call