strange error messages with 1.0.1 with integrated .NET Framework 2.0

[graeme]

My windows xp pro sp2 CD is at F:\ and I am on Source-CD tab
of Windows unattended CD creator [1.0.1 with intergrated .NET 2.0]. I set my target directory for new windows CD to C:\XPCD2.
But I get an error Dialog Box as XCOPY window is reporting that
F:\WIN51 is being copied to C:\XPCD2\WIN51 and WUCDCreator halts.
The error dialog box has several lines of diagnostic ouput. The first line
is

System.IO.IOException: The parameter is incorrect.

then there is 4 lines of [a stack trace ?], the bottom line is

<SNIP>
<SNIP>
<SNIP>
at Creator.Kopieren.copy(DirectoryInfo from, DirectoryInfo to)

How do I work around this ? Is this a bug ?

thanks for any help
best regards
graeme