java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at edu.cornell.mannlib.vitro.webapp.dao.jena.VClassDaoJena.listObjectPropertyValues(VClassDaoJena.java:653)
at edu.cornell.mannlib.vitro.webapp.dao.jena.VClassDaoJena.getSuperClassURIs(VClassDaoJena.java:641)
at edu.cornell.mannlib.vitro.webapp.dao.filtering.VClassDaoFiltering.getSuperClassURIs(VClassDaoFiltering.java:137)
at org.vivoweb.webapp.util.ModelUtils.getPropertyForRoleInClass(ModelUtils.java:64)
at edu.cornell.mannlib.vitro.webapp.visualization.utilities.UtilitiesRequestHandler.generateAjaxVisualization(UtilitiesRequestHandler.java:153)
at edu.cornell.mannlib.vitro.webapp.controller.visualization.AjaxVisualizationController.renderVisualization(AjaxVisualizationController.java:138)
at edu.cornell.mannlib.vitro.webapp.controller.visualization.AjaxVisualizationController.processAjaxRequest(AjaxVisualizationController.java:103)
at edu.cornell.mannlib.vitro.webapp.controller.visualization.AjaxVisualizationController.doGet(AjaxVisualizationController.java:72)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:617)

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