Our team has been using xwiki for several months, love it. I am still new to xwiki, first post. Upgraded our 2.1 today on Windows 2008 r2 64bit. Some errors have been seen in the past with registrations. I don't think velocity is working correctly. When I configure the wiki for a new user - without email registration, the new user is created correctly. If I turn on email confirmation, it fails with this error in red letters; Passwords are different or password is empty. - Yes, phat fingers have been double checked, several times ;) If I try again, it says in red that; User already exists. It does create the new userid, inactive. When I check the users rights, HOWEVER they have edit green checkmark in the Groups XWikiAdminGroup ! This does not happen without the java error below, for a new user without the email confirmation. 2010-02-11 14:43:32,491 [http://wiki/xwiki/bin/register/XWiki/Register] ERROR api.XWiki - Failed to create user com.xpn.xwiki.XWikiException: Error number 11004 in 11: Exception while creating user Wrapped Exception: java.lang.NullPointerException at com.xpn.xwiki.XWiki.createUser(XWiki.java:3495) at com.xpn.xwiki.api.XWiki.createUser(XWiki.java:1183) at com.xpn.xwiki.api.XWiki.createUser(XWiki.java:1156) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at org.apache.velocity.util.introspection.UberspectImpl$VelMethodImpl.doInvoke(UberspectImpl.java:389) ... Wrapped Exception: java.lang.NullPointerException at java.util.Hashtable.put(Unknown Source) at com.xpn.xwiki.plugin.mailsender.MailSenderPluginApi.sendMail(MailSenderPluginApi.java:166) at com.xpn.xwiki.plugin.mailsender.MailSenderPluginApi.sendRawMessage(MailSenderPluginApi.java:124) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) I have java in the path; Path=C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\PROGRA~1\java\jre6\bin;C:\PROGRA~1\java\jre6\lib;C:\Windows\System32\WindowsPowerShell\v1.0\;C:\PROGRA~2\java\jre6\bin;C:\Program Files (x86)\Java\jre6\bin;C:\Program Files (x86)\Java\jre6\lib;C:\webroot\MySQLServer5.1\bin;C:\Program Files (x86)\Java\jre6\bin\client;C:\Program Files (x86)\Java\jre6\bin; Server Information Tomcat Version JVM Version JVM Vendor OS Name OS Version OS Architecture Apache Tomcat/6.0.20 1.6.0_17-b04 Sun Microsystems Inc. Windows Server 2008 R2 6.1 x86 Processors: 2 Processor speed: 2.3 GHz Processor type: Intel(R) Xeon(R) CPU E5530 Physical memory: 2000 MB Video driver: Microsoft Virtual Machine Bus Video Device Kernel version: Windows Server 2008 R2 Enterprise, Multiprocessor Free Product type: Advanced Server Product version: 6.1 Service pack: 0 Kernel build number:7600 I will be glad to find any error, or try any suggestions. I have logging on, and I did try debugging once also. What other information would be helpful? John Carter