net.sf.saxon.trans.DynamicError: A sequence of more than one item is not allowed as the third argument of concat()

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    net.sf.saxon.trans.DynamicError: A sequence of more than one item is not allowed as the third argument of concat()
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    Root Cause Analysis

    1. com.amazonaws.AmazonClientException

      Unable to calculate a request signature: Empty key

      at com.amazonaws.auth.AbstractAWSSigner.sign()
    2. AWS SDK for Java - Core
      AbstractAWSSigner.signAndBase64Encode
      1. com.amazonaws.auth.AbstractAWSSigner.sign(AbstractAWSSigner.java:90)
      2. com.amazonaws.auth.AbstractAWSSigner.signAndBase64Encode(AbstractAWSSigner.java:68)
      2 frames