java.lang.IllegalArgumentException: birthday should not be null!

com.coremedia.cache.EvaluationException: java.lang.IllegalArgumentException: birthday should not be null!
	at com.coremedia.cache.EvaluationException.maybeWrap(EvaluationException.java:19)
	at com.coremedia.cache.Cache.doCompute(Cache.java:1457)
	at com.coremedia.cache.Cache.compute(Cache.java:1704)
	at com.coremedia.cache.Cache.make(Cache.java:1532)
	at com.coremedia.cache.Cache.getOrPeek(Cache.java:577)
	at com.coremedia.cache.Cache.get(Cache.java:485)
	at com.coremedia.objectserver.dataviews.AbstractDataViewFactory.load(AbstractDataViewFactory.java:153)
	at de.top.corem.datamodel.pageframe.PageFrameImpl$$.getBean()
	at de.top.corem.webapp.interceptor.CheckNiceUrlInterceptor.postHandle(CheckNiceUrlInterceptor.java:70)
	at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:782)
	at com.coremedia.objectserver.web.DispatcherServlet.doDispatch(DispatcherServlet.java:56)
	at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:716)
	at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:644)
	at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:549)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
	at de.top.corem.webapp.filter.authentication.SigninFilter.doFilter(SigninFilter.java:70)
	at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:237)
	at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:167)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
	at de.top.corem.webapp.filter.authentication.AuthenticationFilter.doFilter(AuthenticationFilter.java:114)
	at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:237)
	at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:167)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
	at de.top.corem.webapp.filter.impl.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:34)
	at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:237)
	at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:167)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
	at org.terracotta.modules.tomcat.tomcat_5_5.SessionValve55.tcInvoke(SessionValve55.java:100)
	at org.terracotta.modules.tomcat.tomcat_5_5.SessionValve55.invoke(SessionValve55.java:85)
	at org.terracotta.session.ModernTomcatSessionValve.invoke(ModernTomcatSessionValve.java:66)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
	at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:555)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)
	at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:857)
	at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)
	at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
	at java.lang.Thread.run(Thread.java:662)
Caused by: java.lang.IllegalArgumentException: birthday should not be null!
	at de.top.corem.util.ZodiacSign.getInstance(ZodiacSign.java:47)
	at de.top.corem.datamodel.starprofil.StarprofilImpl.getZodiacSign(StarprofilImpl.java:116)
	at de.top.corem.datamodel.starprofil.StarprofilImpl$$.$$loadZodiacSign()
	at de.top.corem.datamodel.starprofil.StarprofilImpl$$.load()
	at com.coremedia.objectserver.dataviews.AbstractDataViewFactory$Key.doInstantiate(AbstractDataViewFactory.java:357)
	at com.coremedia.objectserver.dataviews.AbstractDataViewFactory$Key.evaluate(AbstractDataViewFactory.java:347)
	at com.coremedia.cache.Cache.toValue(Cache.java:1209)
	at com.coremedia.cache.Cache.doCompute(Cache.java:1451)
	... 45 more