TDLib Flutter issue with TdClient

[mabexx]

when I run it says ( in short TdClient is undefined and idk how to fix it)
ERROR: lib/chat_page.dart:38:25: Error: The method 'send' isn't defined for the class 'TdLibService'.
ERROR: - 'TdLibService' is from 'package:project_x/tdlib_service.dart' ('lib/tdlib_service.dart').
ERROR: Try correcting the name to the name of an existing method, or defining a method named 'send'.
ERROR: widget.tdlibService.send({
ERROR: ^^^^
ERROR: lib/tdlib_service.dart:7:14: Error: Type 'TdClient' not found.
ERROR: late final TdClient _client;
ERROR: ^^^^^^^^
ERROR: lib/tdlib_service.dart:7:14: Error: 'TdClient' isn't a type.
ERROR: late final TdClient _client;
ERROR: ^^^^^^^^
ERROR: lib/tdlib_service.dart:15:15: Error: The method 'TdClient' isn't defined for the class 'TdLibService'.
ERROR: - 'TdLibService' is from 'package:project_x/tdlib_service.dart' ('lib/tdlib_service.dart').
ERROR: Try correcting the name to the name of an existing method, or defining a method named 'TdClient'.
ERROR: _client = TdClient();
ERROR: ^^^^^^^^
ERROR: Target kernel_snapshot_program failed: Exception
I tried lots of things but I wanna hear yours so thanks

[levlam]

You need to address the question to the author of the used Dart wrapper.