launch a mod pack "ozone2" when arriving on the map this closes on its own

I want to run minecraft on the ozone 2 mod pack everything is fine everything loads correctly then all of a sudden after selecting the part I have a little loading time then it closes and come back to the launcher and tell me " The game crashed whilst loading nbt data Error: java.io.EOFException Exit code: -1 "I would like to have more details about his