Error: Could not find JobId Service: AmazonRekognition; Status Code: 400; - amazon-web-services

Question

I am using this Java Lambda code provided by AWS to detect labels in a video:
https://github.com/awsdocs/amazon-rekognition-developer-guide/blob/master/code_examples/java_examples/stored_video/java-lambda-handler-sns.java
//Copyright 2018 Amazon.com, Inc. or its affiliates. All Rights Reserved.
//PDX-License-Identifier: MIT-0 (For details, see https://github.com/awsdocs/amazon-rekognition-developer-guide/blob/master/LICENSE-SAMPLECODE.)
package com.amazonaws.lambda.demo;
import com.amazonaws.services.lambda.runtime.Context;
import com.amazonaws.services.lambda.runtime.LambdaLogger;
import com.amazonaws.services.lambda.runtime.RequestHandler;
import com.amazonaws.services.lambda.runtime.events.SNSEvent;
import java.util.List;
import com.amazonaws.regions.Regions;
import com.amazonaws.services.rekognition.AmazonRekognition;
import com.amazonaws.services.rekognition.AmazonRekognitionClientBuilder;
import com.amazonaws.services.rekognition.model.GetLabelDetectionRequest;
import com.amazonaws.services.rekognition.model.GetLabelDetectionResult;
import com.amazonaws.services.rekognition.model.LabelDetection;
import com.amazonaws.services.rekognition.model.LabelDetectionSortBy;
import com.amazonaws.services.rekognition.model.VideoMetadata;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
public class JobCompletionHandler implements RequestHandler<SNSEvent, String> {
#Override
public String handleRequest(SNSEvent event, Context context) {
String message = event.getRecords().get(0).getSNS().getMessage();
LambdaLogger logger = context.getLogger();
// Parse SNS event for analysis results. Log results
try {
ObjectMapper operationResultMapper = new ObjectMapper();
JsonNode jsonResultTree = operationResultMapper.readTree(message);
logger.log("Rekognition Video Operation:=========================");
logger.log("Job id: " + jsonResultTree.get("JobId"));
logger.log("Status : " + jsonResultTree.get("Status"));
logger.log("Job tag : " + jsonResultTree.get("JobTag"));
logger.log("Operation : " + jsonResultTree.get("API"));
if (jsonResultTree.get("API").asText().equals("StartLabelDetection")) {
if (jsonResultTree.get("Status").asText().equals("SUCCEEDED")){
GetResultsLabels(jsonResultTree.get("JobId").asText(), context);
}
else{
String errorMessage = "Video analysis failed for job "
+ jsonResultTree.get("JobId")
+ "State " + jsonResultTree.get("Status");
throw new Exception(errorMessage);
}
} else
logger.log("Operation not StartLabelDetection");
} catch (Exception e) {
logger.log("Error: " + e.getMessage());
throw new RuntimeException (e);
}
return message;
}
void GetResultsLabels(String startJobId, Context context) throws Exception {
LambdaLogger logger = context.getLogger();
AmazonRekognition rek = AmazonRekognitionClientBuilder.standard().withRegion(Regions.US_EAST_1).build();
int maxResults = 1000;
String paginationToken = null;
GetLabelDetectionResult labelDetectionResult = null;
String labels = "";
Integer labelsCount = 0;
String label = "";
String currentLabel = "";
//Get label detection results and log them.
do {
GetLabelDetectionRequest labelDetectionRequest = new GetLabelDetectionRequest().withJobId(startJobId)
.withSortBy(LabelDetectionSortBy.NAME).withMaxResults(maxResults).withNextToken(paginationToken);
labelDetectionResult = rek.getLabelDetection(labelDetectionRequest);
paginationToken = labelDetectionResult.getNextToken();
VideoMetadata videoMetaData = labelDetectionResult.getVideoMetadata();
// Add labels to log
List<LabelDetection> detectedLabels = labelDetectionResult.getLabels();
for (LabelDetection detectedLabel : detectedLabels) {
label = detectedLabel.getLabel().getName();
if (label.equals(currentLabel)) {
continue;
}
labels = labels + label + " / ";
currentLabel = label;
labelsCount++;
}
} while (labelDetectionResult != null && labelDetectionResult.getNextToken() != null);
logger.log("Total number of labels : " + labelsCount);
logger.log("labels : " + labels);
}
}
When checking the results in cloudwatch I receive an error:

05:23:48
Rekognition Video Operation:=========================

05:23:48
Job id: "f647269c4f8bab504cfc9e50a2d89593e463c31755e3bdf41fac18b8be603d65"

05:23:48
Status : "SUCCEEDED"

05:23:48
Job tag : null

05:23:48
Operation : "StartLabelDetection"

05:23:49
*Error: Could not find JobId (Service: AmazonRekognition; Status Code: 400; Error Code: ResourceNotFoundException; Request ID: c4d9bbe0-00f2-11e9-8aa2-21ecd18719a6)*

05:23:49
com.amazonaws.services.rekognition.model.ResourceNotFoundException: Could not find JobId (Service: AmazonRekognition; Status Code: 400; Error Code: ResourceNotFoundException; Request ID: c4d9bbe0-00f2-11e9-8aa2-21ecd18719a6): java.lang.RuntimeException java.lang.RuntimeException: com.amazonaws.services.rekognition.model.ResourceNotFoundException: Could not find JobId (Service: AmazonRekognition; S

05:23:49
END RequestId: 4f531035-00f2-11e9-96d7-f55b78da9771

05:23:49
REPORT RequestId: 4f531035-00f2-11e9-96d7-f55b78da9771 Duration: 941.37 ms Billed Duration: 1000 ms Memory Size: 1024 MB Max Memory Used: 98 MB
I am using the root account and have set up AWS as described in the " Create the AWS Toolkit for Eclipse Lambda Project" Rekognition developer-guide.
Is the problem with the code or something else ?

Answer 1

After consulting with AWS Rekognition forum I was advised to make sure I am calling the fucntion from the same region as stipulated in the function :
AmazonRekognition rek =
AmazonRekognitionClientBuilder.standard().withRegion(Regions.US_EAST_1).build();