Dmg Not Opening High Sierra

Getting the following error when trying to create a High Sierra VM.

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The DMG does mount, but VirtualBox refuses to use it for a VM.
Failed to open the disk image file /Volumes/L/Software 2016/Mac OS X/10.13 High Sierra/MacOS_High_Sierra_v10.13[Developer_Beta_4]/macOS_10.13_Beta_4[17A315i].dmg.
Could not open the medium '/Volumes/L/Software 2016/Mac OS X/10.13 High Sierra/MacOS_High_Sierra_v10.13[Developer_Beta_4]/macOS_10.13_Beta_4[17A315i].dmg'.
VD: error VERR_VD_DMG_INVALID_HEADER opening image file '/Volumes/L/Software 2016/Mac OS X/10.13 High Sierra/MacOS_High_Sierra_v10.13[Developer_Beta_4]/macOS_10.13_Beta_4[17A315i].dmg' (VERR_VD_DMG_INVALID_HEADER).
Result Code:
NS_ERROR_FAILURE (0x80004005)
Component:
MediumWrap

Mac Sierra Dmg

Interface:
IMedium {4afe423b-43e0-e9d0-82e8-ceb307940dda}
Callee: High
IVirtualBox {0169423f-46b4-cde9-91af-1e9d5b6cd945}

Dmg Not Opening High Sierra Version

Callee RC:

Dmg File Not Opening Mac High Sierra

VBOX_E_OBJECT_NOT_FOUND (0x80BB0001)