I tried everything I could but it didn't work! First of all, thank you for your answer and guidance! I uploaded the codes on GitHub! If you can check my codes and tell me where the problem is! I'm going crazy!!! I want to use Logger as DI in the whole project! This code I uploaded is a small part of my project so that I can find the problem! I used the same method in all classes and that's why I get the same error message in all classes https://github.com/farhadesmaeili/my_site