TypeError: 'NoneType' object is not subscriptable

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[ WARN:[email protected]] global D:\a\opencv-python\opencv-python\opencv\modules\imgcodecs\src\loadsave.cpp (239) cv::findDecoder imread_('./datasets/mobile_data_img'): can't open/read file: check file path/integrity Traceback (most recent call last): File "main.py", line 146, in tf.app.run() File "C:\Users\For36\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.7_qbz5n2kfra8p0\LocalCache\local-packages\Python37\site-packages\tensorflow\python\platform\app.py", line 125, in run _sys.exit(main(argv)) File "main.py", line 114, in main max_to_keep=FLAGS.max_to_keep) File "C:\Users\For36\Desktop\New folder\DCGAN-tensorflow-master\model.py", line 93, in init imreadImg = imread(self.data[0]) File "C:\Users\For36\Desktop\New folder\DCGAN-tensorflow-master\utils.py", line 56, in imread img_rgb = img_bgr[..., ::-1] TypeError: 'NoneType' object is not subscriptable

how do i fix this