And you're sure you are running the game as admin?
If you are and you're still getting that error, send me the .worldSave file from the Maps directory on Discord and I'll take a look at it!
What do you mean by "Running the game as admin"? I didn't think you could!
When you right click on an icon you can choose "Run as Administrator", or you can go into Properties->Compatibility and turn it on permanently. :)
Oh! But what does it mean tho