lqe/ldx installation issue

There's nothing related with lqe and ldx in jts.log. lqe.log is as below:

2017-08-24 21:17:06,300 [    Default Executor-thread-32] ERROR com.ibm.team.jis.lqe.web.LQEUtil                    - Exception thrown

java.lang.NoClassDefFoundError: org/apache/xerces/util/XMLChar

        at com.hp.hpl.jena.rdf.model.impl.Util.notNameChar(Util.java:108)

        at com.hp.hpl.jena.rdf.model.impl.Util.splitNamespace(Util.java:66)

        at com.hp.hpl.jena.graph.Node_URI.getLocalName(Node_URI.java:75)

        at com.hp.hpl.jena.rdf.model.impl.ResourceImpl.getLocalName(ResourceImpl.java:150)

        at com.hp.hpl.jena.rdf.model.impl.PropertyImpl.checkLocalName(PropertyImpl.java:65)

        at com.hp.hpl.jena.rdf.model.impl.PropertyImpl.<init>(PropertyImpl.java:73)

        at com.hp.hpl.jena.rdf.model.ResourceFactory$Impl.createProperty(ResourceFactory.java:301)

        at com.hp.hpl.jena.rdf.model.ResourceFactory.createProperty(ResourceFactory.java:156)

        at com.hp.hpl.jena.vocabulary.RDF.property(RDF.java:42)

        at com.hp.hpl.jena.vocabulary.RDF.<clinit>(RDF.java:55)

        at com.hp.hpl.jena.ontology.impl.OntResourceImpl.<clinit>(OntResourceImpl.java:58)

        at com.hp.hpl.jena.enhanced.BuiltinPersonalities.<clinit>(BuiltinPersonalities.java:37)

        at com.hp.hpl.jena.rdf.model.impl.ModelCom.<init>(ModelCom.java:70)

        at com.hp.hpl.jena.rdf.model.ModelFactory.createDefaultModel(ModelFactory.java:140)