Games that won't play after download...

Certain games come up on the DS as "SAV file not found" even though 5 seconds prior to the message it asked me if I wanted it to create a SAV file. Carnival Games is one of those games. Anyone have the fix to this. I was told another file could be downloaded to fix all the games that do this but I can't find it.

It's most likely Anti-Piracy. It's on many of the newer and some of the older roms.
There are patches for many. - http://forum.romulation.net/index.php?topic=29845.0

Or you may need to upgrade your firmware and such.
Check here for info http://forum.romulation.net/index.php?topic=1462.0