What does this K3B error mean?

I have a CD made with Windows XP's burner which has a directory named
"Leroy Visit" containing files named in the form:

House, Lake and Sculpture park <nnn>.jpg

where <nnn> should be replaced with 001 through 055.

When I try to add anything to it (there's only 42MB used) K3B returns
errors (see below along with the debugging information).

What is this telling me?  Is the problem with the CD or am I missing a
software component?  Of course, if you know what to do about the problem
that would be wonderful! :-)

K3B messages:

Unmounting disk
Searching previous session
Could not determine size of resulting image file
Size calculated: 0 blocks

The debugging information shows:

System
-----------------------
K3b Version:0.11.14
KDE Version: 3.3.1-9.el4 Red Hat
QT Version: 3.3.3

mkisofs
-----------------------
NO Rock Ridge present
Disabling Rock Ridge / XA / AA
Warning: Neither Rock Ridge (-R) nor TRANS.TBL (-T)
name translations were found on previous session.
ISO (8.3) file names have been used instead.
/usr/bin/mkisofs: Error: '/LEROYVIS/HOUSE_~2.JPG' and
'/LEROYVIS/HOUSE_~2.JPG' have the same Rock Ridge name 'HOUSE_~2.JPG'.
/usr/bin/mkisofs: Error: '/LEROYVIS/HOUSE_~1.JPG' and
'/LEROYVIS/HOUSE_~1.JPG' have the same Rock Ridge name 'HOUSE_~1.JPG'.
/usr/bin/mkisofs: Error: '/LEROYVIS/HOUSE_~3.JPG' and
'/LEROYVIS/HOUSE_~3.JPG' have the same Rock Ridge name 'HOUSE_~3.JPG'.
/usr/bin/mkisofs: Unable to sort directory /LEROYVIS

msinfo
-----------------------
0,33005

msinfo comand:
-----------------------
/usr/bin/cdrecord dev=/dev/hdc -msinfo



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