ESXI 6.7 - Clone vmdk fails on change tracker error code 5948

vmkfstools -i /vmfs/volumes/ssd-ds1/filer/filer.vmdk /vmfs/volumes/ssd-ds2/filer/filer.vmdk
Destination disk format: VMFS zeroedthick
Cloning disk '/vmfs/volumes/ssd-ds1/filer/filer.vmdk'...
Clone: 100% done.Failed to clone disk: Invalid change tracker error code (5948).

Resolution:

1. rm the change tracker file (filer-ctk.vmdk)
2. vi /vmfs/volumes/ssd-ds1/filer/filer.vmdk , comment out the change tracker line. 
3. Repeat clone (vmkfstools -i)