No Backup possible with existing snapshots

Hi,

i wanted to backup a VM on my esxi-server. For testing purposes I first backed up the VM without any existing snapshots - everything worked fine.

Then I created a snapshot with the vsphere client and tried to run the backup again - without success.

The log tells me:

2013-01-16 08:59:18 -- info: ============================== ghettoVCB LOG START ==============================

2013-01-16 08:59:18 -- info: CONFIG - VERSION = 2013_01_11_0

2013-01-16 08:59:18 -- info: CONFIG - GHETTOVCB_PID = 10904948

2013-01-16 08:59:18 -- info: CONFIG - VM_BACKUP_VOLUME = /vmfs/volumes/ESXi-Backup/ESXi_Backup

2013-01-16 08:59:18 -- info: CONFIG - VM_BACKUP_ROTATION_COUNT = 3

2013-01-16 08:59:18 -- info: CONFIG - VM_BACKUP_DIR_NAMING_CONVENTION = 2013-01-16_08-59-17

2013-01-16 08:59:18 -- info: CONFIG - DISK_BACKUP_FORMAT = thin

2013-01-16 08:59:18 -- info: CONFIG - POWER_VM_DOWN_BEFORE_BACKUP = 0

2013-01-16 08:59:18 -- info: CONFIG - ENABLE_HARD_POWER_OFF = 0

2013-01-16 08:59:18 -- info: CONFIG - ITER_TO_WAIT_SHUTDOWN = 3

2013-01-16 08:59:18 -- info: CONFIG - POWER_DOWN_TIMEOUT = 5

2013-01-16 08:59:18 -- info: CONFIG - SNAPSHOT_TIMEOUT = 15

2013-01-16 08:59:18 -- info: CONFIG - LOG_LEVEL = info

2013-01-16 08:59:18 -- info: CONFIG - BACKUP_LOG_OUTPUT = /tmp/ghettoVCB-2013-01-16_08-59-18-10904948.log

2013-01-16 08:59:18 -- info: CONFIG - ENABLE_COMPRESSION = 0

2013-01-16 08:59:18 -- info: CONFIG - VM_SNAPSHOT_MEMORY = 0

2013-01-16 08:59:18 -- info: CONFIG - VM_SNAPSHOT_QUIESCE = 0

2013-01-16 08:59:18 -- info: CONFIG - ALLOW_VMS_WITH_SNAPSHOTS_TO_BE_BACKEDUP = 1

2013-01-16 08:59:18 -- info: CONFIG - VMDK_FILES_TO_BACKUP = all

2013-01-16 08:59:18 -- info: CONFIG - VM_SHUTDOWN_ORDER =

2013-01-16 08:59:18 -- info: CONFIG - VM_STARTUP_ORDER =

2013-01-16 08:59:18 -- info: CONFIG - EMAIL_LOG = 0

2013-01-16 08:59:18 -- info:

2013-01-16 08:59:20 -- info: ###### Final status: ERROR: No VMs backed up! ######

2013-01-16 08:59:20 -- info: ============================== ghettoVCB LOG END ================================

Using ghettoVCB from 2013-01-14 on ESXi 4.1

Any Idea what is wrong?