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via Stack Overflow by b.bab
, 1 year ago
A sequence of more than one item is not allowed as the third argument of concat()
com.amazonaws.AmazonClientException: Unable to calculate a request signature: Empty key	at com.amazonaws.auth.AbstractAWSSigner.sign(AbstractAWSSigner.java:90)	at com.amazonaws.auth.AbstractAWSSigner.signAndBase64Encode(AbstractAWSSigner.java:68)