My signalR connection is established but can not invoke the hub function.

[SFareedi]

After establishing the signalR hub connection, when i try to invoke the Hub function as following

domElement.btnConnect.click(function () { objHub.server.adminConnect(); });

I got the following error.

There was an error invoking Hub method 'signalrhub.AdminConnect'. at Object.error (jquery.signalR-2.2.2.min.js:9) at init.l (jquery.signalR-2.2.2.min.js:9) at t.fn.init. (jquery.signalR-2.2.2.min.js:9) at t.fn.init. (jquery.signalR-2.2.2.min.js:9) at t.fn.init.dispatch (jquery-1.10.2.js:5109) at t.fn.init.elemData.handle (jquery-1.10.2.js:4780) at Object.trigger (jquery-1.10.2.js:5021) at init.triggerHandler (jquery-1.10.2.js:5711) at Object.triggerReceived (jquery.signalR-2.2.2.min.js:9) at WebSocket.e.socket.e.socket.onmessage (jquery.signalR-2.2.2.min.js:9)