Thanks a lot for your efforts. So I'm a little unsure if by "that directory" you mean that there IS a file called 'SaveFiles' but just in case there isn't the easiest fix is to just create that file yourself inside the StreamingAssets folder.
If there IS a file called 'SaveFiles' you could try making a text file and calling it 'Save0.txt' then copying this into it:
0
0
4
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Otherwise I'm afraid I have honestly have no idea what the problem is and I'm very sorry for the inconvenience. Thank you for you're help and patience though we really appreciate it :)