cannot connect to host

[mosaw]

bro I cannot connect with laravel beyond websockets it always gives me
Installing build\app\outputs\flutter-apk\app.apk...
Debug service listening on ws://127.0.0.1:54085/Zd3X4mW7qZo=/ws
Syncing files to device sdk gphone x86...
E/flutter ( 9337): [ERROR:flutter/lib/ui/ui_dart_state.cc(199)] Unhandled Exception: Null check operator used on a null value
E/flutter ( 9337): #0 EventChannel.binaryMessenger (package:flutter/src/services/platform_channel.dart:518:86)

notice : iam using paid host on degital ocean vps , it works fine with web but donot work with flutter