The temp file is created when you open a game file or create a new game. Everything is stored in the temp file until you save. Then all the changes are saved to your game file. The temp file is deleted when you quit GameMaker.
Thanks Al this helped me find the file (GMAKER.Temp), but I don't see what to do. I looked at the permission & it says that it is read & write. I've tried a few methods that didn't seem to do anything.
First I started by making a new game (in case I did something to screw up one of the files) and did the same process I did with the game I'm making. This didn't do anything, I encountered the same error, so I know that I didn't screw up any of the files.
Second, I tried moving the temp file into the game folder, but this only caused the program to create another GMAKER.Temp file in the 'GameMaker 3994 folder', but this is where the weird thing happened. It made another filled called 'TRON' (which is the name of the file, and the game I'm making) in the 'GameMaker 3994 folder' I don't know if this is good, bad, or me just being a noob. Can you guys please help me.