Assinatura digital

pessoal, estou tentando assinar um xml mas ta dando erro. To usando o xmlsec 1.4

olha o erro:

org.apache.xml.security.transforms.InvalidTransformException: Unknown transformation. No handler installed for URI http://www.w3.org/TR/2001/REC-xml-c14n-20010315#WithComments
	at org.apache.xml.security.transforms.Transform.<init>(Unknown Source)
	at org.apache.xml.security.transforms.Transform.getInstance(Unknown Source)
	at org.apache.xml.security.transforms.Transform.getInstance(Unknown Source)
	at org.apache.xml.security.transforms.Transforms.addTransform(Unknown Source)

alguem sabe me dizer porque isso acontece???

XMLSignature signer = 
         new XMLSignature(doc, baseURI, XMLSignature.ALGO_ID_SIGNATURE_RSA_SHA1);

      element.appendChild(signer.getElement());

      Transforms transforms = new Transforms(doc);
      transforms.addTransform(Transforms.TRANSFORM_ENVELOPED_SIGNATURE);

A ultima linha que ta acontecendo o erro, ao addTransform...

preciso de ajuda :shock:

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