I found problem FAILED org.eclipse.jetty.server.session.SessionHandler@d93

Directory Highcharts for Vaadin 7
1

I found problem FAILED org.eclipse.jetty.server.session.SessionHandler@d93621: java.lang.IllegalStateException: Multiple servlets map to path: /*: AmlUIServlet,org.vaadin.highcharts.demo.DemoUI$Servlet
What should I do?Thanks