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Dear @mansourmoufid and @eskimo, thank you very much for your support. I have read some documents and examples. However I couldn't construct the code. There is a function that creates .ini file; And when I call that function under mainwidget; I print this directory; But I think .json files are not in that directory. Also the directory seems wrong whatsoever. Normally main.py, kivy file and json files are located in same file. I simply can't load .json file to that directory. I am trying 2 ways. First one, I try to add them to created .ini file due to this explanation; Second is add them to another .ini file and use that .ini file as directory. But in both ways I have failed so far. I keep try and read and learn more about it. If you have some comment about that I appreciate a lot.

Anyone ?