substitutions.py is a file in your "renpy" folder (which is a folder you should see wherever you extracted your game). attempting to open it with something like microsoft visual studio will show you all the lines of code in it, you should delete the 248th and 249th ones.
if you don't wanna do it yourself, send the substitutions.py file here (via google drive, dropbox or whatever), do not copy and paste the lines here, it wouldn't help lol. other files are irrelevant.
