User283571144 posted
Hi zhyanadil.it@gmail.com,
According to your description, I couldn't directly find out the reason why you get this error.
Could you please tell me the signlar client-side and server-side(hub method) is in the same web application?
Besides, I suggest you could check your startup.cs file to make sure you have add the app.MapSignalR();
method.
If possbile, please explain more about how to create your signalr application in your web application.
Best Regards,
Brando