installation problems

hi, I want to install xwiki on my server. I have installed the database and the xwiki-app in my tomcat. If I call the url "http://localhost:8180/bin/view/Main/WebHome", I will get following error: javax.servlet.ServletException org.apache.catalina.security.SecurityUtil.execute(SecurityUtil.java:284) org.apache.catalina.security.SecurityUtil.doAsPrivilege(SecurityUtil.java:157) java.security.AccessController.doPrivileged(Native Method) com.xpn.xwiki.web.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:127) *root cause *java.lang.NoClassDefFoundError net.sf.cglib.core.KeyFactory$Generator.generateClass(KeyFactory.java:167) net.sf.cglib.core.DefaultGeneratorStrategy.generate(DefaultGeneratorStrategy.java:25) net.sf.cglib.core.AbstractClassGenerator.create(AbstractClassGenerator.java:215) net.sf.cglib.core.KeyFactory$Generator.create(KeyFactory.java:145) net.sf.cglib.core.KeyFactory.create(KeyFactory.java:117) net.sf.cglib.core.KeyFactory.create(KeyFactory.java:108) net.sf.cglib.core.KeyFactory.create(KeyFactory.java:104) org.hibernate.impl.SessionFactoryImpl.<clinit>(SessionFactoryImpl.java:319) org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1055) com.xpn.xwiki.store.XWikiHibernateStore.initHibernate(XWikiHibernateStore.java:124) com.xpn.xwiki.store.XWikiHibernateStore.checkHibernate(XWikiHibernateStore.java:258) com.xpn.xwiki.store.XWikiHibernateStore.loadXWikiDoc(XWikiHibernateStore.java:570) com.xpn.xwiki.store.XWikiCacheStore.loadXWikiDoc(XWikiCacheStore.java:123) com.xpn.xwiki.XWiki.getDocument(XWiki.java:565) com.xpn.xwiki.XWiki.getDocument(XWiki.java:599) com.xpn.xwiki.XWiki.getXWikiPreference(XWiki.java:1019) com.xpn.xwiki.XWiki.getXWikiPreference(XWiki.java:1014) com.xpn.xwiki.XWiki.preparePlugins(XWiki.java:422) com.xpn.xwiki.XWiki.initXWiki(XWiki.java:397) com.xpn.xwiki.XWiki.<init>(XWiki.java:343) com.xpn.xwiki.XWiki.getMainXWiki(XWiki.java:134) com.xpn.xwiki.XWiki.getXWiki(XWiki.java:202) Has someone an idea? kind regards, F.O.