I was playing the game but when I saved the game and after I closed it the game doesn't open anymore I have uninstalled it and it doesn't work it say's that there is a problem with line 34 saying that there is a TypeError
For all I can find, it seems like your save got corrupted, apparently is something than sometimes just happen in essentials' games.
All I can really do for you is telling you that your save is located here: "C:\Users\(your user)\AppData\Roaming\Pokemon Lewd Virus", you can find it quickly searching "%appdata%" in your quickbar.
Sorry I can't give you any more help with this.
You press the windows key and type %appdata% there you should find a folder with the game's name, and inside it a file named "Game.rxdata", that's your save.
About avoiding it, there isn't really something you can do, it was just bad luck, all I can really suggest you to do is to keep a backup of your save, in case it gets corrupted again.