Module DevicePowerOn failed

Encountered this error when importing vmdks from VMware workstation or fusion to ESXi.

An unexpected error was received from the ESX host while powering on VM vm-1504.
Module DevicePowerOn power on failed.
Unable to create virtual SCSI device for scsi0:0, '/vmfs/volumes/4fcd0d6b-387b9d9a-520a-001a4b503824/xxxxx/xxxxx/xxxxx.vmdk'
Failed to open disk scsi0:0: Unsupported or invalid disk type 7.  Ensure that the disk has been imported.

Run vmkfstools -i to clone disk to an ESXi supported format.

# vmkfstools -i original.vmdk converted.vmdk
Destination disk format: VMFS zeroedthick
Cloning disk 'original.vmdk'...
Clone: 100% done.

VM KB
http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1028943

If this doesn't work, use VMware converter to import the VM into a vCenter instance or directly to an ESXi host.  In most cases, it would probably be more simple to do this in the first place...