我收到一个看起来像这样的错误代码，但不知道为什么。
因此，到目前为止，我一直在使用亚马逊端到端的开发人员身份验证实现。一切似乎都正常，但是一旦我尝试使用dynamodb做某事，就会出现此错误。
AWSiOSSDKv2 [Error] AWSCredentialsProvider.m line:528 | __40-[AWSCognitoCredentialsProvider refresh]_block_invoke352 | Unable to refresh. Error is [Error Domain=com.amazonaws.service.cognitoidentity.DeveloperAuthenticatedIdentityProvider Code=0 "(null)"]
The request failed. Error: [Error Domain=com.amazonaws.service.cognitoidentity.DeveloperAuthenticatedIdentityProvider Code=0 "(null)"]
有什么帮助吗？
更新 1：来自认知同步演示的日志输出我删除了我认为应该是私人的信息，并将其替换为[编辑的信息]
2016-02-19 15:32:42.594 CognitoSyncDemo[2895:67542] initializing clients...
2016-02-19 15:32:43.028 CognitoSyncDemo[2895:67542] json: { "identityPoolId": "[redacted info]", "identityId": "[redacted info]", "token": "[redacted info]",}
2016-02-19 15:32:43.056 CognitoSyncDemo[2895:67542] Error in registering for remote notifications. Error: Error Domain=NSCocoaErrorDomain Code=3010 "REMOTE_NOTIFICATION_SIMULATOR_NOT_SUPPORTED_NSERROR_DESCRIPTION" UserInfo={NSLocalizedDescription=REMOTE_NOTIFICATION_SIMULATOR_NOT_SUPPORTED_NSERROR_DESCRIPTION}
2016-02-19 15:32:54.449 CognitoSyncDemo[2895:67542] AWSiOSSDKv2 [Debug] AWSCognitoSQLiteManager.m line:1455 | -[AWSCognitoSQLiteManager filePath] | Local database is: /Users/MrMacky/Library/Developer/CoreSimulator/Devices/29BB1E0D-538D-4167-9069-C02A0628F1B3/data/Containers/Data/Application/1A86E139-5484-4F29-A3FD-25F81DE055EB/Documents/CognitoData.sqlite3
2016-02-19 15:32:54.451 CognitoSyncDemo[2895:67542] AWSiOSSDKv2 [Debug] AWSCognitoSQLiteManager.m line:221 | __39-[AWSCognitoSQLiteManager getDatasets:]_block_invoke | query = 'SELECT Dataset, LastSyncCount, LastModified, ModifiedBy, CreationDate, DataStorage, RecordCount FROM CognitoMetadata WHERE IdentityId = ?'
2016-02-19 15:33:00.946 CognitoSyncDemo[2895:67542] json: { "identityPoolId": "[redacted info]", "identityId": "[redacted info]", "token": "[redacted info]",}
2016-02-19 15:33:00.947 CognitoSyncDemo[2895:67542] AWSiOSSDKv2 [Error] AWSCognitoService.m line:215 | __36-[AWSCognito refreshDatasetMetadata]_block_invoke180 | Unable to list datasets: Error Domain=com.amazon.cognito.AWSCognitoErrorDomain Code=-4000 "(null)"
查看异常，您似乎正在尝试从模拟器进行推送同步。您无法在模拟器上接收远程通知。