Connecting with colyseus in angular 7

I am new to colyseus. I am writing client end code in Angular 7 and failing to connect with server.
Below is the code I have written in my client side component ts file -

import {Client, Room} from 'colyseus.js';

export class AppComponent implements OnInit {
private chatRoom: Room;

ngOnInit(): void {
var client = new Client('ws://localhost:3553');
console.log("client ", client);

this.chatRoom = client.join('gameplay', {channel: 'Default'});


I am getting null in 'id' key for client instance log.
And getting the following error on server end code -

Error: seat reservation expired.
at WebSocketServer.<anonymous> (E:\Kijana\config\node_modules\colyseus\lib\transport\WebSocketTransport.js:101:27)
at (<anonymous>)
at E:\Kijana\config\node_modules\colyseus\lib\transport\WebSocketTransport.js:8:71
at new Promise (<anonymous>)
at __awaiter (E:\Kijana\config\node_modules\colyseus\lib\transport\WebSocketTransport.js:4:12)
at WebSocketServer.onConnection (E:\Kijana\config\node_modules\colyseus\lib\transport\WebSocketTransport.js:83:16)
at emitTwo (events.js:126:13)
at WebSocketServer.emit (events.js:214:7)
at handleUpgrade (E:\Kijana\config\node_modules\ws\lib\websocket-server.js:98:18)
at WebSocketServer.completeUpgrade (E:\Kijana\config\node_modules\ws\lib\websocket-server.js:331:5)

Hi @garimabhasin ,I think maybe there is any mistake in your code, you post message is too little information. Did you used the sample project before? You can try.