Invalid SIF file status 14 error?

I've just created an nLited version of XP Pro (slipstreamed with SP3 + drivers for Aspire One/Asus eeePC 701SD) and copied it onto a USB FlyDrive and a MicroSD card so I could install it on two machines at the same time. I used the MicroSD on the Asus and the FlyDrive for the Acer. Everything went well on both (much faster and smoother process on the Acer, for the record!). However, when I went to install again from the same media on another computer (another Acer I got for a friend), I got a funny error:

Code:

INF file txtsetup.sif is corrupt or missing, status 14.

Setup cannot continue. Press any key to exit.

At first I thought this was a subtle difference between the three USB ports (e.g. maybe only one of the three works for OS installs and I randomly used a different one for this second Acer), but then I tried all the ports and got the same result. Next I thought maybe my flash media got corrupted, but I'm getting the same message on both the MicroSD (in a USB holder, obviously), and the FlyDrive.

What's going on? What does this error message mean? Can I only install from my flash 1 time then I need to re-load the files onto it? (that would defeat a large part of the purpose of nLite'd installs anyway...)