a questions about calling opensaml lib

[whut_jia]

Hi,
I am  writing a apache module mainly for validating saml assertion.Now,I have 
already post signed assertion data to my apache server and in my handler module 
,I have also received assertion data .   But ,when I validate assertion with 
opensaml lib,some questions are appeared: Opensaml Library initialization 
failed. and program are staying this sentence all the time.Why do this 
phenomenon  take place ??
Thanks for your consideration.
Regards.
Jia