NameError: name 'predictor' is not defined

[zhanglu11]

I have installed the package and can import it, and I can run the code deepsort.demo(), but when running： test_file = 'D:/rwork/allcount.csv' predictor.predict(test_file, save_path='results') it reports an error： Traceback (most recent call last): File "", line 1, in NameError: name 'predictor' is not defined Could anyone help me with this error？