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java.lang.NullPointerException: 	at org.apereo.cas.support.saml.web.idp.profile.builders.enc.SamlObjectSigner.verifySamlProfileRequestIfNeeded(SamlObjectSigner.java:409)	at org.apereo.cas.support.saml.web.idp.profile.builders.enc.SamlObjectSigner$$FastClassBySpringCGLIB$$84e9b1fd.invoke()	at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:204)	at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:720)	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157)	at org.springframework.aop.support.DelegatingIntroductionInterceptor.doProceed(DelegatingIntroductionInterceptor.java:133)	at org.springframework.aop.support.DelegatingIntroductionInterceptor.invoke(DelegatingIntroductionInterceptor.java:121)	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)	at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:655)	at org.apereo.cas.support.saml.web.idp.profile.builders.enc.SamlObjectSigner$$EnhancerBySpringCGLIB$$cc188ec1.verifySamlProfileRequestIfNeeded()	at org.apereo.cas.support.saml.web.idp.profile.AbstractSamlProfileHandlerController.initiateAuthenticationRequest(AbstractSamlProfileHandlerController.java:408)	at org.apereo.cas.support.saml.web.idp.profile.SSOPostProfileHandlerController.handleSsoPostProfileRequest(SSOPostProfileHandlerController.java:71)	at org.apereo.cas.support.saml.web.idp.profile.SSOPostProfileHandlerController.handleSaml2ProfileSsoRedirectRequest(SSOPostProfileHandlerController.java:43)