Problem with WebDAV migration during upgrade from v3 to v4

I have followed all steps correctly to update from v3.14 to v4.0.  I can
start the site up and view all pages and I'm now ready to run the WebDAV
migration via:

 

engineName/filemanager/op/edit/pid/1?screen=migrate
<http://localhost:8080/jahia/Jahia/engineName/filemanager/op/edit/pid/1?
screen=migrate> 
 
However when I run that page I get the following error:
 
<!--
Error :
 
null
 
 
Exception StackTrace: Cause level : 0 (level 0 is the most precise
exception)
java.lang.NullPointerException
        at
org.jahia.services.webdav.DAVFileAccess$NamespaceHelper.<init>(DAVFileAc
cess.java:1065)
        at
org.jahia.services.webdav.DAVFileAccess.setNamespace(DAVFileAccess.java:
107)
        at
org.jahia.services.webdav.DAVFileAccess.<init>(DAVFileAccess.java:90)
        at
org.jahia.services.webdav.JahiaWebdavBaseService.getDAVFileAccess(JahiaW
ebdavBaseService.java:47)
        at
org.jahia.services.webdav.JahiaWebdavBaseService.migrate(JahiaWebdavBase
Service.java:72)
        at
org.jahia.engines.filemanager.DAVFilemanager_Engine.handleActions(DAVFil
emanager_Engine.java:193)
        at
org.jahia.operations.OperationManager.handleOperations(OperationManager.
java:279)
        at org.jahia.bin.JahiaAction.execute(JahiaAction.java:50)
        at
org.apache.struts.action.RequestProcessor.processActionPerform(RequestPr
ocessor.java:484)
        at
org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:
274)
        at
org.apache.struts.action.ActionServlet.process(ActionServlet.java:1482)
        at org.jahia.bin.Jahia.process(Jahia.java:1441)
        at org.jahia.bin.Jahia.service(Jahia.java:766)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:809)
        at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Applica
tionFilterChain.java:200)
        at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilt
erChain.java:146)
        at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValv
e.java:209)
        at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.i
nvokeNext(StandardPipeline.java:596)
        at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:4
33)
        at
org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:948)
        at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValv
e.java:144)
        at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.i
nvokeNext(StandardPipeline.java:596)
        at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:4
33)
        at
org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:948)
        at
org.apache.catalina.core.StandardContext.invoke(StandardContext.java:235
8)
        at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java
:133)
        at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.i
nvokeNext(StandardPipeline.java:596)
        at
org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherVa
lve.java:118)
        at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.i
nvokeNext(StandardPipeline.java:594)
        at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java
:116)
        at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.i
nvokeNext(StandardPipeline.java:594)
        at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:4
33)
        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$StandardPipelineValveContext.i
nvokeNext(StandardPipeline.java:596)
        at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:4
33)
        at
org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:948)
        at
org.apache.coyote.tomcat4.CoyoteAdapter.service(CoyoteAdapter.java:152)
        at
org.apache.jk.server.JkCoyoteHandler.invoke(JkCoyoteHandler.java:300)
        at
org.apache.jk.common.HandlerRequest.invoke(HandlerRequest.java:374)
        at
org.apache.jk.common.ChannelSocket.invoke(ChannelSocket.java:743)
        at
org.apache.jk.common.ChannelSocket.processConnection(ChannelSocket.java:
675)
        at
org.apache.jk.common.SocketConnection.runIt(ChannelSocket.java:866)
        at
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool
.java:683)
        at java.lang.Thread.run(Thread.java:534)
 
 
-->
 

 

Any ideas?

 

Ps. The only step I had to do slightly different was the step:

 

"Your Jahia is now migrated, but the Tomcat which was packaged with your
Jahia 3.1.4 is an older version (4.1.12 or 4.1.18) As Jahia 4.0 is
packaged with Tomcat 4.1.27, you should replace the old version by this
one."

 

I had to use the latest stable version of Jahia as that's all I could
find on your website.

 

Regards,

 

Miles.
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