Start up problems

Hi All

Can anyone help to debug this problem I am having.

I built an app using WO5.3 and deployed on a server with 5.2  
installed and it all worked fine.

Now I am trying to deploy on a 5.3 Tiger server and I get this error  
message in the log:

at java.lang.Class.newInstance0(Class.java:350)
         at java.lang.Class.newInstance(Class.java:303)
         at com.webobjects.appserver.WOApplication.main 
(WOApplication.java:323)
         at Application.main(Application.java:26)
         at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
         at sun.reflect.NativeMethodAccessorImpl.invoke 
(NativeMethodAccessorImpl.java:39)
         at sun.reflect.DelegatingMethodAccessorImpl.invoke 
(DelegatingMethodAccessorImpl.java:25)
         at java.lang.reflect.Method.invoke(Method.java:585)
         at com.webobjects._bootstrap.WOBootstrap.main 
(WOBootstrap.java:71)

Any ideas?

Gino