Cannot change the Credentials Provider

In the sample.properties fie, I added a different credentials Provider:
"AWSCredentialsProvider = EnvironmentVariableCredentialsProvider".
I have also set the Environment variable with correct credentials
When I run the consumer, it errors out with ::

java.util.concurrent.ExecutionException: com.amazonaws.AmazonClientException: Unable to load AWS credentials from any provider in the chain
at java.util.concurrent.FutureTask.report(Unknown Source)
at java.util.concurrent.FutureTask.get(Unknown Source)
at com.amazonaws.services.kinesis.multilang.MultiLangDaemon.main(MultiLangDaemon.java:217)
Caused by: com.amazonaws.AmazonClientException: Unable to load AWS credentials from any provider in the chain
at com.amazonaws.auth.AWSCredentialsProviderChain.getCredentials(AWSCredentialsProviderChain.java:117)
at com.amazonaws.services.kinesis.multilang.MultiLangDaemon.prepare(MultiLangDaemon.java:123)
at com.amazonaws.services.kinesis.multilang.MultiLangDaemon.call(MultiLangDaemon.java:148)
at com.amazonaws.services.kinesis.multilang.MultiLangDaemon.call(MultiLangDaemon.java:61)
at java.util.concurrent.FutureTask.run(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)

Start by locating the sample.properties handling and the MultiLangDaemon.prepare entry point referenced in the stack trace. Trace how AWSCredentialsProvider is read and instantiated, then reproduce the consumer run with EnvironmentVariableCredentialsProvider; done means the configured provider supplies the environment credentials without the provider-chain error.

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