I cannot open a Simulink model file, the import wizard is always opened

Hi, I cannot open an own Simulink model from the file; the import wizard is launched every time I am trying to do it. But the model is correctly runned if I called it from a script. What can I do? I need to modify the blocks into the model.

[Sherpa Engineering]

I had the same problem and I opened my Simulink model using open_system('ModelName') command