cannot update logo

Hi,

I cannot update my logo on Jahia5.0.1_r16138
My server is
fedora4+jdk1.5.0_06+mysql4.1.
This is some error from
catalina.out:

896493 [2007-01-10 10:53:54,015]
[org.apache.catalina.core.ContainerBase.[Catalina].[localhost].[/jahia]]
INFO - Your Jahia Server has generated an error. Please review the details
below for additional information:
Severity : CRITICAL
Error : User
message=Error while processing request, System message=Exception in
processing pipeline, root cause:null
URL : http://172.17.5.1:8080/jahia/Jahia/engineName/filemanager/op/edit/pid/1
Method : POST
Remote host : 172.17.5.55 Remote
Address : 172.17.5.55
Request headers :

accept:image/gif, image/x-xbitmap, image/jpeg, image/pjpeg,
application/vnd.ms-excel, application/vnd.ms-powerpoint, application/msword,
application/x-shockwave-flash, */*

referer:http://172.17.5.1:8080/jahia/Jahia/engineName/filemanager/op/edit/pid/1?screen=info&path=/shared/tomcatsmall.gif&source=fileManager

accept-language:th

content-type:application/x-www-form-urlencoded

accept-encoding:gzip, deflate
user-agent:Mozilla/4.0
(compatible; MSIE 6.0; Windows NT 5.1; SV1; Alexa Toolbar)

host:172.17.5.1:8080
content-length:69

connection:Keep-Alive
cache-control:no-cache
.
........
Cause level : 0 (level 0 is the most precise
exception)
java.lang.NullPointerException
at
org.jahia.services.webdav.DAVFileAccess.getStatus(DAVFileAccess.java:1491)
at
org.jahia.engines.filemanager.DAVFilemanager_Engine.loadProperties(DAVFilemanager_Engine.java:1260)
at
org.jahia.engines.filemanager.DAVFilemanager_Engine.getInfos(DAVFilemanager_Engine.java:279)
at
org.jahia.engines.filemanager.DAVFilemanager_Engine.handleActions(DAVFilemanager_Engine.java:226)
.....
Cause
level : 1
org.jahia.exceptions.JahiaException: User message=Error while
processing request, System message=Exception in processing pipeline, root
cause:null root cause=java.lang.NullPointerException
at
org.jahia.operations.OperationManager.handleOperations(OperationManager.java:107)
at
org.jahia.bin.JahiaAction.execute(JahiaAction.java:72)
at
org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:421)

Thank
you

pittaykom