Windows 10 installs, but tas failes with error message

When we deploy Windows 10 unsing an unattend.xml the task failed with this error message:

ErrorMessage: Exception has occured in File FileUtils.cpp at Line No 193. Type of exception is GeneralError. Error Description is FileUtilsCreateFile() - something went wrong.. Value of Windows error code = 3 and message is The system cannot find the path specified.

Strange enough Windows 10 is installed correctly using the unattend.xml.

The 'Run Boot To Production' task fails also and no autoinstall of the Symantec Management Agent.

We use a similar process for windows 7 and this works withour problems.

Any suggestions?