Error while calling API DetectDocumentTextAsync - One or more errors occurred. (Unable to get IAM security credentials from EC2 Instance Metadata Service

Question

Hi I am sharing below error, dont know why this error showing.2-3 days before this code was working and now i am getting this error, i have not changed any setting. Please help to understand this error
Code showing error

var result = new DetectDocumentTextResponse();
			var s3Object = new S3Object {
				Bucket = bucketName,
				Name = key
			};
			var request = new DetectDocumentTextRequest();
			request.Document = new Document {
				S3Object = s3Object
			};
// line returning error
			return await this.textract.DetectDocumentTextAsync(request);

System.AggregateException
  HResult=0x80131500
  Message=One or more errors occurred. (Unable to get IAM security credentials from EC2 Instance Metadata Service.)
  Source=System.Private.CoreLib
  StackTrace:
   at System.Threading.Tasks.Task.ThrowIfExceptional(Boolean includeTaskCanceledExceptions)
   at System.Threading.Tasks.Task.Wait(Int32 millisecondsTimeout, CancellationToken cancellationToken)
   at System.Threading.Tasks.Task.Wait()
   at Dotnet_Core.ArgHandlers.DetectTextS3Handler.Handle(String bucketName, String s3File) in D:\amazon-textract-code-samples-master\amazon-textract-code-samples-master\src-csharp\ArgHandlers\DetectTextS3Handler.cs:line 14
   at Dotnet_Core.Program.Main(String[] args) in D:\amazon-textract-code-samples-master\amazon-textract-code-samples-master\src-csharp\Program.cs:line 55

This exception was originally thrown at this call stack:
    [External Code]
    Dotnet_Core.Services.TextractTextDetectionService.DetectTextS3(string, string) in TextractTextDetectionService.cs

Inner Exception 1:
AmazonServiceException: Unable to get IAM security credentials from EC2 Instance Metadata Service.

Answer

Dear Jady,
Thankyou for your response, below is peace of code i am using
I am not using ec2 instance, even not created, using dotnet core application on laptop and accessing Textract sdk
var builder = new ConfigurationBuilder() 
.SetBasePath(Environment.CurrentDirectory)
.AddJsonFile("appsettings.json", optional: false, reloadOnChange: true)
				.AddEnvironmentVariables()
				.Build();
var awsOptions = builder.GetAWSOptions();
			Console.WriteLine(awsOptions.Profile + ":" + awsOptions.ProfilesLocation + ": " + awsOptions.Region.DisplayName);

IAmazonTextract textract =awsOptions.CreateServiceClient();
  var request = new StartDocumentTextDetectionRequest();
            request.DocumentLocation = new DocumentLocation
            {   S3Object = new S3Object
			{  Bucket =  "testautomatelab",       
                            Name = "test-files/employmentapp.png"                }
            };
            var response =  textract.StartDocumentTextDetectionAsync(request);
}

Receiving response
Id = 263, Status = Faulted, Method = "{null}", Result = "{Not yet computed}"

Response Inner exception
One or more errors occurred. (Unable to get IAM security credentials from EC2 Instance Metadata Service

Answer

Hi,

To better understand your issue, could you please 
1. How did your code get the necessary permission? if you use AWS SDK could you please provide the code block.

2. As it was working before, could you please verify your EC2 instance is healthy and has correct IAM attached, if possible, could you please try to relaunch a new instance and deploy the code to see if it works on new instance.

Thanks

Error while calling API DetectDocumentTextAsync - One or more errors occurred. (Unable to get IAM security credentials from EC2 Instance Metadata Service

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