[xmlsec] Error "libxml2 library function failed:expr=xpointer"

[Florent]

Hello,

When running the command

xmlsec1 --verify /tmp/saml-payload.xml

I get the following error:

func=xmlSecXPathDataExecute:file=xpath.c:line=273:obj=unknown:subj=xmlXPtrEval:error=5:libxml2
library function
failed:expr=xpointer(id('_16f38644-6274-4ed9-b616-dfec0ba7f160'))
func=xmlSecXPathDataListExecute:file=xpath.c:line=373:obj=unknown:subj=xmlSecXPathDataExecute:error=1:xmlsec
library function failed:
func=xmlSecTransformXPathExecute:file=xpath.c:line=483:obj=xpointer:subj=xmlSecXPathDataExecute:error=1:xmlsec
library function failed:
func=xmlSecTransformDefaultPushXml:file=transforms.c:line=2405:obj=xpointer:subj=xmlSecTransformExecute:error=1:xmlsec
library function failed:
func=xmlSecTransformCtxXmlExecute:file=transforms.c:line=1236:obj=unknown:subj=xmlSecTransformPushXml:error=1:xmlsec
library function failed:transform=xpointer
func=xmlSecTransformCtxExecute:file=transforms.c:line=1296:obj=unknown:subj=xmlSecTransformCtxXmlExecute:error=1:xmlsec
library function failed:
func=xmlSecDSigReferenceCtxProcessNode:file=xmldsig.c:line=1571:obj=unknown:subj=xmlSecTransformCtxExecute:error=1:xmlsec
library function failed:
func=xmlSecDSigCtxProcessSignedInfoNode:file=xmldsig.c:line=804:obj=unknown:subj=xmlSecDSigReferenceCtxProcessNode:error=1:xmlsec
library function failed:node=Reference
func=xmlSecDSigCtxProcessSignatureNode:file=xmldsig.c:line=547:obj=unknown:subj=xmlSecDSigCtxProcessSignedInfoNode:error=1:xmlsec
library function failed:
func=xmlSecDSigCtxVerify:file=xmldsig.c:line=366:obj=unknown:subj=xmlSecDSigCtxSignatureProcessNode:error=1:xmlsec
library function failed:
Error: signature failed
ERROR
SignedInfo References (ok/all): 0/1
Manifests References (ok/all): 0/0
Error: failed to verify file "/tmp/saml-payload.xml"

Here is the saml-payload.xml file:
http://pastebin.com/raw.php?i=irxdfPsj
(I've formatted it and edited some values in the pasted file)

I can't see why I get this error
  libxml2 library function
  failed:expr=xpointer(id('_16f38644-6274-4ed9-b616-dfec0ba7f160'))
, even after reading the FAQ, any idea?

Thanks!
-- 
Florent