opensaml unmarshall Exception

[whut_jia]

Hi,
Thank you for your suggestion and your concern !
That question last weekend have been resolved .But when I unmarshall  DOM 
Document into SAML Object , there is an error : Caught an XMLSecurity exception 
while loading signature :OpenSSL : X509--Error transating Base64 DER encoding 
into OpenSSL X509 structure .
I also google  this question ,but have not get answers.I need your 
suggestion.Please!
Thank you !