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java.lang.NullPointerException: 	at org.apache.xml.security.c14n.implementations.CanonicalizerBase.engineCanonicalizeXPathNodeSet(CanonicalizerBase.java:361)	at org.apache.xml.security.transforms.implementations.TransformC14NWithComments.enginePerformTransform(TransformC14NWithComments.java:124)	at org.apache.xml.security.transforms.Transform.performTransform(Transform.java:333)	at org.apache.xml.security.transforms.Transforms.performTransforms(Transforms.java:260)	at org.apache.xml.security.signature.Reference.getContentsAfterTransformation(Reference.java:510)	at org.apache.xml.security.signature.Reference.dereferenceURIandPerformTransforms(Reference.java:701)	at org.apache.xml.security.signature.Reference.getReferencedBytes(Reference.java:765)	at org.apache.xml.security.signature.Reference.calculateDigest(Reference.java:790)	at org.apache.xml.security.signature.Reference.generateDigestValue(Reference.java:441)	at org.apache.xml.security.signature.Manifest.generateDigestValues(Manifest.java:214)	at org.apache.xml.security.signature.XMLSignature.sign(XMLSignature.java:529)