Sorry for the thread necromancy, but others may have had this too.
This NW.js profile message is a problem with lots of RPG Maker games lately, just a warning message that you can ignore and close if all you do is play games. To fix it:
Edit the file package.json in the same folder as Game.exe by changing the "name" entry that's probably "" to something unique for each game that's affected. Like for this game, "Bunny Hunter". (If you have a copy of RMMV, or this keeps happening, also edit the package.json file in the www folder to the same "name" entry contents but leave the other stuff alone.)
More discussion of this at my devlog at:
https://tarwix.itch.io/the-milky-dragon-v106-mod/devlog/782666/fixing-the-nwjs-p...
Your save issue is something separate.