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Openstack Juno -Windows 2012 STD/ R2 fails after sysprep


I am creating Windows RAW image file for KVM Hypervisor for Openstack using the autounattend answer file which installs the OS, install cloudbase init and then do a sysprep with another unattend answer file. Once the image is created I use the image to spawn the instances. However after creating first instance all other instance fail to spawn, using the base image, with the below error message. I have tried modifying the setting in the unattend answer file but in vain.

""The computer restarted unexpectedly or encountered an unexpected error. Windows installation cannot proceed""

PS: I have 2 Openstack Juno setup and this image works fine in one and behaves as mentioned above in other.