javascript - Uncaught (in promise) Error: Failed to invoke 'XXXXX' due to an error on the server - Stack Overflo

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I created a core chat application using SignalR and I used WebRTC for video calls. As I need to send the SDP to the receiver using server method so I created a hub method call "SendOffer". When I click Video call button I have invoked this "SendOffer" method. I have put the client side code below

var connection = new signalR.HubConnectionBuilder()
    .withUrl('/chat')
    .build();

const Peer = new RTCPeerConnection();

const video = document.querySelector('video');

const constraints = {
    'video': true,
    'audio': true
}

document.getElementById("sendVideo").addEventListener("click", function (event) {

    navigator.mediaDevices.getUserMedia({
        video: true,
        audio: true,
    }).then(function (stream) {
        video.srcObject = stream
        video.play();
        //Peer.addStream(stream);
        Peer.createOffer()
            .then(sdp => Peer.setLocalDescription(sdp))
            .then(function () {
                console.log(Peer.localDescription);
                //connection.invoke("SendOffer", Peer.localDescription).catch(function (err) {
                //    return console.error(err.toString());
                connection.invoke("SendOffer", Peer.localDescription);
            })
    });
})

But this gives an error in the console log and not working. blow is the error

signalr.js:2088 Uncaught (in promise) Error: Failed to invoke 'SendOffer' due to an error on the server. at _this.callbacks. (signalr.js:2088) at HubConnection.processIningData (signalr.js:2182) at WebSocketTransport.HubConnection.connection.onreceive (signalr.js:1905) at WebSocket.webSocket.onmessage (signalr.js:3949)

Can any one please help me to solve this error.

I created a core chat application using SignalR and I used WebRTC for video calls. As I need to send the SDP to the receiver using server method so I created a hub method call "SendOffer". When I click Video call button I have invoked this "SendOffer" method. I have put the client side code below

var connection = new signalR.HubConnectionBuilder()
    .withUrl('/chat')
    .build();

const Peer = new RTCPeerConnection();

const video = document.querySelector('video');

const constraints = {
    'video': true,
    'audio': true
}

document.getElementById("sendVideo").addEventListener("click", function (event) {

    navigator.mediaDevices.getUserMedia({
        video: true,
        audio: true,
    }).then(function (stream) {
        video.srcObject = stream
        video.play();
        //Peer.addStream(stream);
        Peer.createOffer()
            .then(sdp => Peer.setLocalDescription(sdp))
            .then(function () {
                console.log(Peer.localDescription);
                //connection.invoke("SendOffer", Peer.localDescription).catch(function (err) {
                //    return console.error(err.toString());
                connection.invoke("SendOffer", Peer.localDescription);
            })
    });
})

But this gives an error in the console log and not working. blow is the error

signalr.js:2088 Uncaught (in promise) Error: Failed to invoke 'SendOffer' due to an error on the server. at _this.callbacks. (signalr.js:2088) at HubConnection.processIningData (signalr.js:2182) at WebSocketTransport.HubConnection.connection.onreceive (signalr.js:1905) at WebSocket.webSocket.onmessage (signalr.js:3949)

Can any one please help me to solve this error.

• javascript
• c#
• asp-core-mvc
• webrtc

Share Improve this question Follow asked Apr 5, 2020 at 21:15 janitha kalshanjanitha kalshan 6311 silver badge88 bronze badges 1

• Have you found the reason? – Alexander Commented Jan 4, 2023 at 16:52

Add a ment  | 

2 Answers 2

Sorted by: Reset to default 10

Had the same error. In my case that was because of type mismatch. Server expected string. Client was sending value from variable with value '1234', that was sending as a int.

Had a similar problem, and @Vita1ij answer helped me figure out what was the issue. Everything worked perfectly fine until i've added a CancellationToken as a parameter for my hub methods:

public class MyHub : Hub
{
    public async Task HubAction(YourType param, CancellationToken cancellationToken)
    {
        await Clients.All.SendAsync(nameof(HubAction), param, cancellationToken);
    }
}

I didn't realize what has caused this error at first, because i figured that a cancellation token should be included automatically, but unfortunately no.

So, removing this cancellation token solved the issue for me:

public class MyHub : Hub
{
    public async Task HubAction(YourType param)
    {
        await Clients.All.SendAsync(nameof(HubAction), param);
    }
}

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