Empty error at end of installation

Hi,

Right, I was wondering if anyone can help me. I've been searching the 
mailing list archives, and can't find any help with my problem.

Basically, I have set up a Redhat Enterprise server with MySQL 4.1.10, 
and j2sdk 1.4.2_07

I've set everything up as per the documentation, and have added a user 
and database to mysql for jahia. I've then installed jahia as per the 
instructions, and have then got on with the installation through the web 
browser part.

I change the default database over to mysql (i changed the jdbc driver 
as well, as it was causing errors here, but now we're sound), and carry 
on. I get to the end and read the summary of my settings and then submit 
the page, and I get a page saying :
    Jahia Configuration Wizard generates some error(s) :

        Error :

And then no error information.

So I then went and set the error logging on the tomcat server to DEBUG, 
and here's what I get in catalina.out:

.......
4729688 [http-8080-Processor3] DEBUG - Creating table [jahia_locks] ...
4729695 [http-8080-Processor3] DEBUG - Creating table 
[jahia_slide_objects] ...
4729702 [http-8080-Processor3] DEBUG - Creating table 
[jahia_slide_children] ...
4729709 [http-8080-Processor3] DEBUG - Creating table 
[jahia_slide_links] ...
4729716 [http-8080-Processor3] DEBUG - Creating table 
[jahia_slide_permissions] ...
4729723 [http-8080-Processor3] DEBUG - Creating table 
[jahia_slide_locks] ...
4729730 [http-8080-Processor3] DEBUG - Creating table 
[jahia_slide_revisions] ...
4729737 [http-8080-Processor3] DEBUG - Creating table 
[jahia_slide_workingrev] ...
4729744 [http-8080-Processor3] DEBUG - Creating table 
[jahia_slide_latestrev] ...
4729751 [http-8080-Processor3] DEBUG - Creating table 
[jahia_slide_branches] ...
4729758 [http-8080-Processor3] DEBUG - Creating table 
[jahia_slide_revision] ...
4729765 [http-8080-Processor3] DEBUG - Creating table 
[jahia_slide_label] ...
4729772 [http-8080-Processor3] DEBUG - Creating table 
[jahia_slide_property] ...
4729779 [http-8080-Processor3] DEBUG - Inserting customized settings 
into database...
4729783 [http-8080-Processor3] DEBUG - Inserting default database 
content from file 
/usr/local/jahia/jahia405_build6020/tomcat/webapps/jahia/WEB-INF/var/db/default_corporate_port
al_templates.values...
4729970 [http-8080-Processor3] DEBUG - Installing templates...
4730095 [http-8080-Processor3] DEBUG - jahiaSettingsPathJahiaFiles is 
$context/WEB-INF
4730097 [http-8080-Processor3] DEBUG - JahiaXmlDocument.loadFile> 
Entityresolver is null
4730203 [http-8080-Processor3] DEBUG - Installing web applications...
4730209 [http-8080-Processor3] DEBUG - Exception
java.lang.NullPointerException
        at java.util.Hashtable.put(Hashtable.java:393)
        at java.util.Properties.setProperty(Properties.java:102)
        at 
org.jahia.utils.properties.PropertiesManager.setProperty(PropertiesManager.java:152)
        at 
org.jahia.bin.JahiaConfigurationWizard.setPropertiesObject(JahiaConfigurationWizard.java:1863)
        at 
org.jahia.bin.JahiaConfigurationWizard.processValues(JahiaConfigurationWizard.java:1217)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:324)
        at org.jahia.utils.ActionHandler.call(ActionHandler.java:126)
        at 
org.jahia.bin.JahiaConfigurationWizard.dispatcher(JahiaConfigurationWizard.java:390)
        at 
org.jahia.bin.JahiaConfigurationWizard.service(JahiaConfigurationWizard.java:236)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:809)
        at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:200)
        at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:146)
        at 
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:209)
        at 
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:596)
        at 
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:433)
        at 
org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:948)
        at 
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:144)
        at 
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:596)
        at 
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:433)
        at 
org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:948)
        at 
org.apache.catalina.core.StandardContext.invoke(StandardContext.java:2358)
        at 
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:133)
        at 
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:596)
        at 
org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherValve.java:118)
        at 
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:594)
        at 
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:116)
        at 
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:594)
        at 
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:433)
        at 
org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:948)
        at 
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:127)
        at 
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:596)
        at 
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:433)
        at 
org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:948)
        at 
org.apache.coyote.tomcat4.CoyoteAdapter.service(CoyoteAdapter.java:152)
        at 
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:799)
        at 
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:705)
        at 
org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:577)
        at 
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:683)
        at java.lang.Thread.run(Thread.java:534)
4730210 [http-8080-Processor3] DEBUG - Dispatching to 
target=[/jsp/jahia/configuration_wizard/includer.jsp?jsp=error_save]
4730213 [http-8080-Processor3] DEBUG - --[ POST Request End ] --


It's a null pointer exception, and I can't see where it's coming from. 
It seems to be something to do with deployment of the webapp, and a 
friend says it will have something to do with trying to write a null 
value to something in this properties file for the webapp. I haven't put 
any spaces in anything I've entered at all. I just can't figure it out

Anyone lend any help?

Cheers

Martin