itch.io

I haven’t heard of this issue before, but here’s what I dug up on the RPG Maker forums:

“It means that at some point you or other users of your computer have installed/downloaded and launched a higher version of NWjs than RPG maker MV uses. For Windows 10 users (Highly suggest shutting RPG MV off before doing this stuff and back up projects, etc.):

1. Go to your app data folder in Windows (C:\Users\[Your Username]\AppData\Local). If you can't find it, make sure you can see hidden folders.
   
2. Delete the folder "nwjs".
3. Go inside the folder 'User Data". Then go inside the folder "Default". Look for the files "Web Data" and "Web Data-journal". Delete these two files.
   
4. Launch MV and play test.”

I hope this works for you.