After update Openfire to 4.7.1 Pade and Web Clients are not working anymore

after updating to 4.7.1, I face the following exception

Fehler:
java.lang.IncompatibleClassChangeError: Found class org.jivesoftware.openfire.muc.MUCRoom, but interface was expected
	at org.jivesoftware.openfire.plugin.pade.ofmeet_002dsummary_jsp._jspService(ofmeet_002dsummary_jsp.java:212)
	at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:71)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
	at org.jivesoftware.openfire.container.PluginServlet.handleJSP(PluginServlet.java:462)
	at org.jivesoftware.openfire.container.PluginServlet.service(PluginServlet.java:122)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
	at org.eclipse.jetty.servlet.ServletHolder$NotAsync.service(ServletHolder.java:1459)
	at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:799)
	at org.eclipse.jetty.servlet.ServletHandler$ChainEnd.doFilter(ServletHandler.java:1626)
	at org.jivesoftware.admin.PluginFilter.doFilter(PluginFilter.java:226)
	at org.eclipse.jetty.servlet.FilterHolder.doFilter(FilterHolder.java:193)
	at org.eclipse.jetty.servlet.ServletHandler$Chain.doFilter(ServletHandler.java:1601)
	at org.jivesoftware.admin.AuthCheckFilter.doFilter(AuthCheckFilter.java:234)
	at org.eclipse.jetty.servlet.FilterHolder.doFilter(FilterHolder.java:193)
	at org.eclipse.jetty.servlet.ServletHandler$Chain.doFilter(ServletHandler.java:1601)
	at com.opensymphony.sitemesh.webapp.SiteMeshFilter.obtainContent(SiteMeshFilter.java:129)
	at com.opensymphony.sitemesh.webapp.SiteMeshFilter.doFilter(SiteMeshFilter.java:77)
	at org.eclipse.jetty.servlet.FilterHolder.doFilter(FilterHolder.java:193)
	at org.eclipse.jetty.servlet.ServletHandler$Chain.doFilter(ServletHandler.java:1601)
	at org.jivesoftware.util.LocaleFilter.doFilter(LocaleFilter.java:73)
	at org.eclipse.jetty.servlet.FilterHolder.doFilter(FilterHolder.java:193)

Looks like an incompatible change.
This looks similar to this issue

I downgraded again… the old version works for me