Build and Capture Windows 8.1

Hi,

Am simply building and capturing a Windows 8.1 reference image with associated task sequence but get the error below.

Using F8, it appears to have installed but get this message and the process halts.

'windows could not parse the unattend answer file for pass specialize windows shell setup'.

I have verified the product key as suggested in other posts and this is a simple build and capture, there is no unattend.xml in the task sequence.

thanks in advance.