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我自定义了SAMLSingleSignOn扩展，并在项目中添加了MetaData.xml。 访问网站时出现错误提示

HTTP状态500-org.opensaml.saml2.metadata.provider.MetadataProviderException：未配置IDP，请使用至少一个IDP javax.servlet.ServletException更新包含的元数据：org.opensaml.saml2.metadata.provider.MetadataProviderException ：未配置IDP，请使用至少一个IDP更新包含的元数据org.springframework.security.saml.SAMLEntryPoint.commence（SAMLEntryPoint.java:161）org.springframework.security.web.access.ExceptionTranslationFilter.sendStartAuthentication（ExceptionTranslationFilter.java ：186）org.springframework.security.web.access.ExceptionTranslationFilter.handleSpringSecurityException（ExceptionTranslationFilter.java:168）org.springframework.security.web.access.ExceptionTranslationFilter.doFilter（ExceptionTranslationFilter.java:131）org.springframework.security.web .FilterChainProxy $ VirtualFilterChain.doFilter（FilterChainProxy.java:342）org.springframework.security.web.session.SessionManagementFilter.doFilter（SessionManagementFilter.java ：103）org.springframework.security.web.FilterChainProxy $ VirtualFilterChain.doFilter（FilterChainProxy.java:342）org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter（AnonymousAuthenticationFilter.java:113）org.springframework.security.web .FilterChainProxy $ VirtualFilterChain.doFilter（FilterChainProxy.java:342）org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter.doFilter（SecurityContextHolderAwareRequestFilter.java:154）org.springframework.security.web.FilterChainProxy $ VirtualFilterChain.doFilter（FilterChainProxy.java ：342）org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter（RequestCacheAwareFilter.java:45）org.springframework.security.web.FilterChainProxy $ VirtualFilterChain.doFilter（FilterChainProxy.java:342）org.springframework.security.web .FilterChainProxy.doFilterInternal（FilterChainProxy.java:186）org.springframework.security.web.FilterChainProxy.doFilter（FilterChainProxy.java:166）org.springfr amework.security.web.FilterChainProxy $ VirtualFilterChain.doFilter（FilterChainProxy.java:342）org.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter.doFilterInternal（WebAsyncManagerIntegrationFilter.java:50）org.springframework.web.filter。 OncePerRequestFilter.doFilter（OncePerRequestFilter.java:107）org.springframework.security.web.FilterChainProxy $ VirtualFilterChain.doFilter（FilterChainProxy.java:342）org.springframework.security.web.context.SecurityContextPersistenceFilter.doF