Hello.
First post here.
Sometimes I find a file named "save" instead of a folder in the game folder.
It prevents from making any save.
If this is your case, delete the save file and create a folder with the same name.
Hope it helps.
The same thing has happened to me in another game that uses the exact same script for saving. The script is to blame, it's probably got some kind of bug that doesn't create the proper folder if it's not there. What Wahoo said is the solution, you just make the folder and the rest will work out.
What I mean is if you have a file named "Save" with no extention (no ".xxx" at the end) in your game folder (where Game.exe is) instead of a folder named "Save", you can't save.
You have to delete the file and create a new folder named "Save".
Then, you can save.
That's the problem I had and how I resolved it.
Since English is not my native language, I hope that what I'm writing is understandable...
I might not chosen the best words...