Download as PDF is broken

java.lang.ClassNotFoundException: org.apache.pdfbox.pdmodel.PDDocument
	at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1275)
	at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1104)
	at org.apache.openmeetings.web.room.wb.WbPanel.processWbAction(WbPanel.java:219)
	at org.apache.openmeetings.web.room.wb.AbstractWbPanel$1.respond(AbstractWbPanel.java:68)