The automatic splitter does not work What to do to make it work? I use nestopia on my computer

What version of Nestopia do you have?

Nestopia UE 1.51.1

And you're using the autosplitter that's activated from the Edit Splits window? I checked and that one doesn't seem to support 1.51.1 yet (although 1.51.0 should theoretically work?).

In the meantime you could either download an older version of Nestopia, or use my autosplitter which should work with 1.51.1 (and a bunch of other emulators if you prefer one of those).