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java.lang.NullPointerException: null	at com.sun.org.apache.xerces.internal.impl.xs.traversers.XSDHandler.traverseSchemas(XSDHandler.java:1445)	at com.sun.org.apache.xerces.internal.impl.xs.traversers.XSDHandler.parseSchema(XSDHandler.java:630)	at com.sun.org.apache.xerces.internal.impl.xs.XMLSchemaLoader.loadSchema(XMLSchemaLoader.java:616)	at com.sun.org.apache.xerces.internal.impl.xs.XMLSchemaLoader.loadGrammar(XMLSchemaLoader.java:574)	at com.sun.org.apache.xerces.internal.impl.xs.XMLSchemaLoader.loadGrammar(XMLSchemaLoader.java:540)	at com.sun.org.apache.xerces.internal.jaxp.validation.XMLSchemaFactory.newSchema(XMLSchemaFactory.java:252)	at javax.xml.validation.SchemaFactory.newSchema(SchemaFactory.java:627)	at javax.xml.validation.SchemaFactory.newSchema(SchemaFactory.java:659)	at com.onelogin.saml2.util.SchemaFactory.loadFromUrl(SchemaFactory.java:25)	at com.onelogin.saml2.util.Util.validateXML(Util.java:215)