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我有一个冻结的课程,不知何故我无法访问 copyWith 方法。我的错误是什么?

班级:

@freezed
class LoginState with _$LoginState {

  const factory LoginState({
    String? username,
    String? password,
    @Default(false) bool isValid,
    String? errorMessage,
  }) = _LoginState;

  factory LoginState.empty() => LoginState();
  factory LoginState.initial() = _Initial;
}

尝试像这样访问copyWith:

LoginState state = LoginState();
state.copyWith(); //cannot access copyWith
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