Seit Update von Parallels Plesk auf 11.5.30 Bachup Fehler (pmm utility PMMCli raised an exception. Error code is: 2)

[2013-08-09 19:16:14.847|1911] DEBUG: --> <pmmcli.MakeDumpAction object at 0xb73144ec>
[2013-08-09 19:16:14.847|1911] INFO: stdin: <backup-task-description><misc owner-guid="c7ce4d62-823c-4dd5-9589-333d38d74b84" owner-type="server" verbose-level="5" owner-name="server"/><dumps-storage-credentials storage-type="local"><root-dir>/var/lib/psa/dumps</root-dir><file-name/></dumps-storage-credentials><backup-specification><backup-options type="configuration-only" compression-level="standard" suspend="false" mail-to="" description="Server-Backup.&#13;&#10;Erstellungsdatum: Aug 9, 2013 07:16 PM" mssql-native-backup="true"/><object-to-backup type="server" id="1" name="server"/></backup-specification></backup-task-description>  
[2013-08-09 19:16:14.853|1911] INFO: Packet succesfully validated.
[2013-08-09 19:16:14.855|1911] DEBUG: <pmmcli.ActionRunner object at 0xb73142ac>: doActivity
[2013-08-09 19:16:14.856|1911] DEBUG: LOG: init 'backup-backup' (with session=False)  
[2013-08-09 19:16:14.856|1911] DEBUG: LOG: no logs dir in session, create
[2013-08-09 19:16:14.856|1911] DEBUG: LOG: log dir /opt/psa/PMM/logs/backup-2013-08-09-19-16-14-435
[2013-08-09 19:16:14.857|1911] DEBUG: LOG: custom log /opt/psa/PMM/logs/backup-2013-08-09-19-16-14-435/backup.log
[2013-08-09 19:16:14.863|1911] INFO: Executing <subprocess[1912] '/usr/bin/perl /opt/psa/admin/bin/plesk_agent_manager server --get-size -c --session-path=/opt/psa/PMM/sessions/2013-08-09-191614.452'>  
[2013-08-09 19:16:15.017|1911] INFO: Subprocess raised ExecuteException: Subprocess <subprocess[1912] '/usr/bin/perl /opt/psa/admin/bin/plesk_agent_manager server --get-size -c --session-path=/opt/psa/PMM/sessions/2013-08-09-191614.452'> was finished with exit code 2  
== STDOUT ====================

== STDERR ====================

[2013-08-09 19:16:15.019|1911] CRITICAL: PMMUtility exception:
Subprocess <subprocess[1912] '/usr/bin/perl /opt/psa/admin/bin/plesk_agent_manager server --get-size -c --session-path=/opt/psa/PMM/sessions/2013-08-09-191614.452'> was finished with exit code 2  
== STDOUT ====================

== STDERR ====================

Traceback (most recent call last):
  File "/opt/psa/admin/share/pmmcli/pmmcli.py", line 2491, in main  
    data_action_response, errcode_response, error_message = actions.get(sys.argv[1][2:])(parameters)
  File "/opt/psa/admin/share/pmmcli/pmmcli.py", line 2354, in make_dump  
    return ActionRunner(MakeDumpAction, backup_task_description, None).doActivity()
  File "/opt/psa/admin/share/pmmcli/pmmcli.py", line 164, in doActivity  
    result = self.processor.doActivity()
  File "/opt/psa/admin/share/pmmcli/pmmcli.py", line 1349, in doActivity  
    raise PMMUtilityException('PMMCli', x)  
PMMUtilityException: PMMCli was finished with exit code 2

[2013-08-09 19:16:15.020|1911] INFO: Outgoing packet:
<?xml version="1.0" encoding="UTF-8"?>  
<response>
    <errcode>1000</errcode>
    <errmsg>pmm utility 'PMMCli' raised an exception. Error code is: 2  
See pmmcli.log to find out detailed information on this</errmsg>
</response>