I've been seeing this error in a lot among the rpgmaker entries: "Your profile can not be used because it is from a newer version of NW.js. Some features may be unavailable. Please specify a different profile directory or use a newer version of NW.js." My instinct when seeing an error is to immediately copy and paste it into a comment so the dev is aware of it (just in case it either didn't come up in testing or the dev didn't realize it was still there), but in this case I'm not sure if that's the thing to do, in part because I'm not sure if it's the fault of the game that threw the error or a previous game. Is this just a known bug in rpgmaker or something the user can fix?

a search result shows it was a bug when RPG Maker MV first started, so maybe some developers never updated.

This happens when you play a game with a newer version of NW.js and then play another with an older one (1.6 -> 1.5?). It shouldn't affect the game as far as I'm concerned.

It's not a bug at all.

This happens because the developer upgraded the Nw.js version of Rpg Maker Mv to a more updated one. So it will give some performance boost ^^

In fact, this is a good thing.

You can press "OK" and continue to play your game.

(I know that is about a year, but want to leave this comment here in case anyone see that).