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I have built a built a ris server and run riprep on a HP DC5800 Sff.
I then tried to boot from this image, but got the above error.
I have looked at loads of microsoft pages but still get the same message.
I created file \\remoteinstall\setup\english\images\HP_DC5800\$oem$\$1\Drivers\Nic
Then edited the riprep.sif file in the templates folder
OemPreinstall = yes
OemPnpDriversPath = \Drivers\Nic
Restarted the remote installation services.
Booted the PC again, still same error.