Error when using SockJS

[xbassols]

Hello!
I'm encountering an error that seems to be related to the library when trying to connect to a WS using SockJS like that:
var transportPlatform = new BrowserTransportPlatformWithSockJS( sockJSNoCredentials: true, sockJSDebug: true, sockJSProtocolsWhitelist: ['xhr-streaming', 'websocket'], sockJSTimeout: const Duration(seconds: 10));

await transport.WebSocket.connect(Uri.parse(url), transportPlatform: transportPlatform)

Error:
E/flutter (24053): [ERROR:flutter/shell/common/shell.cc(184)] Dart Error: Unhandled exception: E/flutter (24053): 'package:w_transport/src/web_socket/browser/sockjs.dart': error: line 37 pos 12: /flutter/.pub-cache/hosted/pub.dartlang.org/w_transport-3.2.8/lib/src/web_socket/browser/sockjs.dart:37:12: Error: Getter not found: 'context'. E/flutter (24053): if (js.context.hasProperty('SockJS')) { E/flutter (24053): ^^^^^^^ E/flutter (24053): if (js.context.hasProperty('SockJS')) { E/flutter (24053): ^ E/flutter (24053): E/flutter (24053): #0 _AsyncAwaitCompleter.start (dart:async/runtime/libasync_patch.dart:49:6) E/flutter (24053): #1 SockJSWebSocket.connect (package:w_transport/src/web_socket/browser/sockjs.dart:28:35) E/flutter (24053): #2 BrowserTransportPlatformWithSockJS.newWebSocket (package:w_transport/src/browser_transport_platform_with_sockjs.dart:76:28) E/flutter (24053): #3 WebSocket.connect (package:w_transport/src/web_socket/web_socket.dart:128:32)

Any ideas on what could it be?