self contained Vaadin Portlet 7.6.8 and Liferay 6.2

Hi,
I developed a vaadin Portlet and when i deploy on Liferay Portal return this message: Request was not handled by any registered handler.
I followed step of this page https://vaadin.com/liferay and it correctly deploy Portlet into Liferay Portal but when i drop this vaadin portlet to content page return Request was not handled by any registered handler and Eclipse log return this:
mar 31, 2017 2:11:43 PM org.apache.catalina.core.ApplicationDispatcher invoke

INFORMAZIONI: Deployment of configuration descriptor D:\liferay-workspace\source\liferay-portal-6.2-ce-ga5\tomcat-7.0.62\conf\Catalina\localhost\OmniappVaadin-portlet.xml has finished in 6,187 ms
14:11:43,722 ERROR [http-bio-8080-exec-84][PortletServlet:116] javax.portlet.PortletException: com.vaadin.server.ServiceException: com.vaadin.server.ServiceException:  could not be loaded
javax.portlet.PortletException: com.vaadin.server.ServiceException: com.vaadin.server.ServiceException:  could not be loaded
    at com.vaadin.server.VaadinPortlet.handleRequest(VaadinPortlet.java:547)
    at com.vaadin.server.VaadinPortlet.doDispatch(VaadinPortlet.java:614)
    at javax.portlet.GenericPortlet.render(GenericPortlet.java:262)
    at com.liferay.portlet.FilterChainImpl.doFilter(FilterChainImpl.java:103)
    at com.liferay.portlet.ScriptDataPortletFilter.doFilter(ScriptDataPortletFilter.java:55)
    at com.liferay.portlet.FilterChainImpl.doFilter(FilterChainImpl.java:100)
    at com.liferay.portal.kernel.portlet.PortletFilterUtil.doFilter(PortletFilterUtil.java:64)
    at com.liferay.portal.kernel.servlet.PortletServlet.service(PortletServlet.java:112)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
    at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:116)
    at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilter.doFilter(InvokerFilter.java:119)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
    ... 200 more
Caused by: com.vaadin.server.ServiceException:  could not be loaded
    at com.vaadin.server.ServletPortletHelper.verifyUIClass(ServletPortletHelper.java:77)
    at com.vaadin.server.ServletPortletHelper.initDefaultUIProvider(ServletPortletHelper.java:156)
    at com.vaadin.server.VaadinService.createAndRegisterSession(VaadinService.java:773)
    at com.vaadin.server.VaadinService.doFindOrCreateVaadinSession(VaadinService.java:727)
    at com.vaadin.server.VaadinService.findOrCreateVaadinSession(VaadinService.java:668)
    at com.vaadin.server.VaadinService.findVaadinSession(VaadinService.java:527)
    at com.vaadin.server.VaadinService.handleRequest(VaadinService.java:1403)
    ... 122 more
Caused by: java.lang.ClassNotFoundException:
    at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1720)
    at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1571)
    at com.vaadin.server.ServletPortletHelper.verifyUIClass(ServletPortletHelper.java:70)
    ... 128 more

Thank you for help !