KivyMD 2.0.1 error importing _window_sdl2

KivyMD 2.0.1.dev0, python 3.9. when I try to run the code the debugger gives this error sdl2 - ImportError: DLL load failed while importing _window_sdl2: The specified module was not found. but this module is installed on Python Interpreter. What could have caused this error? if someone helps, I will be very grateful