samba - Dec 2009 - problems when trying to upgrade from Samba4 alpha 8 to alpha10

Hi,
I have installed Samba 4 alpha8 on Ubuntu Server 9.10 with openldap backend 
(2.4.20) as described in 
http://wiki.samba.org/index.php/Samba4/HOWTO/Ubuntu_Server_9.04; which is 
working fine so far. Now, I tried to upgrade to alpha 10.
The steps I took were:
- checked out alpha 10 from git
- run make (compiled everything fine)
- shut down running samba daemon
- tried to run? ./scripting/bin/upgradeprovision - s <path to smb.conf in 
samba4 install>
There, I always getting the following error:
***********************************************************
schema_load_init: no schema head present: (skip schema loading)

Traceback (most recent call last):
? File "./scripting/bin/upgradeprovision", line 772, in <module>
??? names = guess_names_from_current_provision(creds,session,paths)
? File "./scripting/bin/upgradeprovision", line 212, in 
guess_names_from_current_provision
??? res3= 
samdb.search(expression="(objectClass=*)",base="CN=Sites,"+configdn,
scope=SCOPE_ONELEVEL, attrs=attrs3)
_ldb.LdbError: (32, 'No such Base DN: 
CN=Sites,CN=Configuration,DC=example,DC=com')
***********************************************************
Any ideas what I am making wrong? any things to look after?

Thanks in advance for helpful pointers!

Regards,
? Dirk    
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