FYI, my project uses some files (eg. .json, .xlsx) and i put them in some folders uder res://. I’m not sure if these files will cause any problem since i did not see them in my exported project.
You can see those errors in the inspect option of your browser, just right click on it and navigate to the console tab in inspect.
And, do you saving the .json file by codes? If so, then it will not work. Instead of it, you need to save it to a server like firebase, silent wolf, etc.