Your builds fail due to Tasks for AWS encountering an InvalidAlgorithmParameterException: the trustAnchors parameter must be non-empty, for example:
04-Mar-2016 10:51:11 Starting task 'Upload Artifacts' of type 'net.utoolity.atlassian.bamboo.tasks-for-aws:aws.s3.object'
04-Mar-2016 10:51:11 Setting maxErrorRetry=7 and awaitTransitionInterval=15000
04-Mar-2016 10:51:11 Using session credentials provided by Identity Federation for AWS Add-on (Connector Selection).
04-Mar-2016 10:51:11 Failed to retrieve session credentials due to Identity Federation for AWS error: com.amazonaws.AmazonClientException: Unable to execute HTTP request: java.lang.RuntimeException: Unexpected error: java.security.InvalidAlgorithmParameterException: the trustAnchors parameter must be non-empty
04-Mar-2016 10:51:11 Finished task 'Upload Artifacts' with result: Error
This exception stems from the Java Virtual Machine trying to execute a HTTP request via SSL, but having trouble to access the local certificate authority trust store on the host system. There seem to be many potential root causes, here are a couple of pointers: