Try to update current 7.1.2 to zimbra8. After updated, a lot of services cant start :

ldap Running
logger Stopped
zmlogswatchctl is not running
mailbox Stopped
zmmailboxdctl is not running.
mta Stopped
zmsaslauthdctl is not running
postfix is not running
snmp Running
stats Running
zmconfigd Stopped
zmconfigd is not running.
after checking, it seems the conf files are not updated. such as /opt/zimbra/postfix/conf/main.cf is empty. It seems caused by zmconfigd not working correctly.

checking /opt/zimbra/log/zmconfigd.log it has following error message
Starting zmconfigd...Traceback (most recent call last):
File "/opt/zimbra/libexec/zmconfigd", line 31, in <module>
import state
File "/opt/zimbra/zimbramon/pylibs/state.py", line 17, in <module>
import localconfig
File "/opt/zimbra/zimbramon/pylibs/localconfig.py", line 18, in <module>
import commands
File "/opt/zimbra/zimbramon/pylibs/commands.py", line 58, in <module>
class Command:
File "/opt/zimbra/zimbramon/pylibs/commands.py", line 60, in Command
P = Provisioning.getInstance(Provisioning.CacheMode.OF F)
AttributeError: type object 'com.zimbra.cs.account.Provisioning' has no attribute 'CacheMode'
but there's no problems with Jar files under /opt/zimbra/lib/jars/

Any body has a clue what happened?