WTG_Mh161

Im working on a mod, that lets you "use" a timer. I know, not the most creative idea. I obvious need to save it, when you close the game and open it later again. I use the import "import net.minecraftforge.network.NetworkEvent;", but its not working. Literally getting Cannot resolve symbol 'NetworkEvent'. Does anyone have a clue why? Is my knowledge outdated for foge? Im coding in 1.20.4 btw :=)