I have used both the JS02 and the JS0B (stock and patched) and havent seen any problems like this before, that said, that doesnt mean that something could of gone wrong.
The last time I seen an error like that was whilst trying to encode and burn on the fly but as you are burning from an image (i take it) then that cant be it. What version of Nero is that you are using?
Also I dont know what the moderators would think to see the last file to be burned was a CD-Key text file??