I need help on websockets

[webpack-dev-server] Trying to reconnect...
WebSocketClient.js:13 WebSocket connection to 'wss://vpoll.com.my/ws' failed:
WebSocketClient @ WebSocketClient.js:13
initSocket @ socket.js:17
(anonymous) @ socket.js:38
timer @ zone.js:2378
invokeTask @ zone.js:406
runTask @ zone.js:178
invokeTask @ zone.js:487
ZoneTask.invoke @ zone.js:476
data.args. @ zone.js:2358Understand this errorAI
index.js:558 [webpack-dev-server] Event {isTrusted: true, type: 'error', target: WebSocket, currentTarget: WebSocket, eventPhase: 2, …}
logger @ index.js:558
(anonymous) @ index.js:728
error @ index.js:177
WebSocketClient.client.onerror @ WebSocketClient.js:16
wrapFn @ zone.js:766
invokeTask @ zone.js:406
runTask @ zone.js:178
invokeTask @ zone.js:487
invokeTask @ zone.js:1648
globalCallback @ zone.js:1679
globalZoneAwareCallback @ zone.js:1712Understand this errorAI
index.js:548 [webpack-dev-server] Trying to reconnect...
WebSocketClient.js:13 WebSocket connection to 'wss://vpoll.com.my/ws' failed:
WebSocketClient @ WebSocketClient.js:13
initSocket @ socket.js:17
(anonymous) @ socket.js:38
timer @ zone.js:2378
invokeTask @ zone.js:406
runTask @ zone.js:178
invokeTask @ zone.js:487
ZoneTask.invoke @ zone.js:476
data.args. @ zone.js:2358Understand this errorAI
index.js:558 [webpack-dev-server] Event {isTrusted: true, type: 'error', target: WebSocket, currentTarget: WebSocket, eventPhase: 2, …}
logger @ index.js:558
(anonymous) @ index.js:728
error @ index.js:177
WebSocketClient.client.onerror @ WebSocketClient.js:16
wrapFn @ zone.js:766
invokeTask @ zone.js:406
runTask @ zone.js:178
invokeTask @ zone.js:487
invokeTask @ zone.js:1648
globalCallback @ zone.js:1679
globalZoneAwareCallback @ zone.js:1712Understand this errorAI
index.js:548 [webpack-dev-server] Trying to reconnect...
WebSocketClient.js:13 WebSocket connection to 'wss://vpoll.com.my/ws' failed:
WebSocketClient @ WebSocketClient.js:13
initSocket @ socket.js:17
(anonymous) @ socket.js:38
timer @ zone.js:2378
invokeTask @ zone.js:406
runTask @ zone.js:178
invokeTask @ zone.js:487
ZoneTask.invoke @ zone.js:476
data.args. @ zone.js:2358Understand this errorAI
index.js:558 [webpack-dev-server] Event {isTrusted: true, type: 'error', target: WebSocket, currentTarget: WebSocket, eventPhase: 2, …}
logger @ index.js:558
(anonymous) @ index.js:728
error @ index.js:177
WebSocketClient.client.onerror @ WebSocketClient.js:16
wrapFn @ zone.js:766
invokeTask @ zone.js:406
runTask @ zone.js:178
invokeTask @ zone.js:487
invokeTask @ zone.js:1648
globalCallback @ zone.js:1679
globalZoneAwareCallback @ zone.js:1712Understand this errorAI
index.js:548 [webpack-dev-server] Trying to reconnect...
WebSocketClient.js:13 WebSocket connection to 'wss://vpoll.com.my/ws' failed:
WebSocketClient @ WebSocketClient.js:13
initSocket @ socket.js:17
(anonymous) @ socket.js:38
timer @ zone.js:2378
invokeTask @ zone.js:406
runTask @ zone.js:178
invokeTask @ zone.js:487
ZoneTask.invoke @ zone.js:476
data.args. @ zone.js:2358Understand this errorAI
index.js:558 [webpack-dev-server] Event {isTrusted: true, type: 'error', target: WebSocket, currentTarget: WebSocket, eventPhase: 2, …}
logger @ index.js:558
(anonymous) @ index.js:728
error @ index.js:177
WebSocketClient.client.onerror @ WebSocketClient.js:16
wrapFn @ zone.js:766
invokeTask @ zone.js:406
runTask @ zone.js:178
invokeTask @ zone.js:487
invokeTask @ zone.js:1648
globalCallback @ zone.js:1679
globalZoneAwareCallback @ zone.js:1712Understand this errorAI