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如何为现有用户池配置 aws amplify in flutter？没有为此用户池配置身份池。我想在不创建身份池的情况下对其进行配置。以下是我当前的amplifyconfiguration.dart文件，

const amplifyConfig = ''' {
  "UserAgent": "aws-amplify-cli/2.0",
  "Version": "1.0",
  "auth": {
      "plugins": {
          "awsCognitoAuthPlugin": {
              "IdentityManager": {
                  "Default": {
                    
                  }
              },
              "CognitoUserPool": {
                  "Default": {
                      "PoolId": "**********",
                      "AppClientId": "**********",
                      "Region": "**********"
                  }
              },
              "Auth": {
                  "Default": {
                      "authenticationFlowType": "USER_SRP_AUTH"
                  }
              }
          }
      }
  }
}''';

每次我尝试登录时，上面的配置都会出现这个错误，

Amplify.Auth.signIn(
      username: 'test@gmail.com',
      password: 'test'
    );

java.lang.Exception: Federation is not enabled, please check if you have CognitoIdentity configured.

如何在不使用身份池的情况下解决此问题？

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