I have had similar issues in the past.
The resolution for me was to remove any hard drives on the server. There is something about how the installer extracts the installer's temp files and when the physical hard drives are present it screws up the install. So pop out the hard drives for the install to the SD card, then when the installer finishes you can put them back in. I have found that the error is not consistent; I dont know why sometimes this occurs and other times it doesn't.
