tensorflow.python.framework.errors_impl.InvalidArgumentError: Requested tensor connection from unknown node: "input:0".

[nipun1992]

I am trying to perform object tracking using Deep SORT algorithm. Python version being used in 3.7

Upon execution of the flask file in the code, it is returning the below exception :

Traceback (most recent call last):
File "C:\Users\nipun.gupta\Downloads\UniquePersonDeepSORT_2\venv\lib\site-packages\flask\app.py", line 2548, in call
return self.wsgi_app(environ, start_response)
File "C:\Users\nipun.gupta\Downloads\UniquePersonDeepSORT_2\venv\lib\site-packages\werkzeug\middleware\dispatcher.py", line 78, in call
return app(environ, start_response)
File "C:\Users\nipun.gupta\Downloads\UniquePersonDeepSORT_2\venv\lib\site-packages\flask\app.py", line 2528, in wsgi_app
response = self.handle_exception(e)
File "C:\Users\nipun.gupta\Downloads\UniquePersonDeepSORT_2\venv\lib\site-packages\flask\app.py", line 2525, in wsgi_app
response = self.full_dispatch_request()
File "C:\Users\nipun.gupta\Downloads\UniquePersonDeepSORT_2\venv\lib\site-packages\flask\app.py", line 1822, in full_dispatch_request
rv = self.handle_user_exception(e)
File "C:\Users\nipun.gupta\Downloads\UniquePersonDeepSORT_2\venv\lib\site-packages\flask\app.py", line 1820, in full_dispatch_request
rv = self.dispatch_request()
File "C:\Users\nipun.gupta\Downloads\UniquePersonDeepSORT_2\venv\lib\site-packages\flask\app.py", line 1796, in dispatch_request
return self.ensure_sync(self.view_functions[rule.endpoint])(**view_args)
File "C:\Users\nipun.gupta\Downloads\UniquePersonDeepSORT_2\src\app_deepsort_api.py", line 163, in PredictImage
output = predictImage(req_data)
File "C:\Users\nipun.gupta\Downloads\UniquePersonDeepSORT_2\src\getImagePredictionDeepSort.py", line 158, in predictImage
boxes, scores, classes, nums = yolo.predict(img_in, steps=1)
File "C:\Users\nipun.gupta\Downloads\UniquePersonDeepSORT_2\venv\lib\site-packages\keras\engine\training_v1.py", line 1067, in predict
use_multiprocessing=use_multiprocessing,
File "C:\Users\nipun.gupta\Downloads\UniquePersonDeepSORT_2\venv\lib\site-packages\keras\engine\training_arrays_v1.py", line 807, in predict
callbacks=callbacks,
File "C:\Users\nipun.gupta\Downloads\UniquePersonDeepSORT_2\venv\lib\site-packages\keras\engine\training_arrays_v1.py", line 316, in model_iteration
batch_outs = f(actual_inputs)
File "C:\Users\nipun.gupta\Downloads\UniquePersonDeepSORT_2\venv\lib\site-packages\keras\backend.py", line 4575, in call
self._make_callable(feed_arrays, feed_symbols, symbol_vals, session)
File "C:\Users\nipun.gupta\Downloads\UniquePersonDeepSORT_2\venv\lib\site-packages\keras\backend.py", line 4502, in _make_callable
callable_fn = session._make_callable_from_options(callable_opts)
File "C:\Users\nipun.gupta\Downloads\UniquePersonDeepSORT_2\venv\lib\site-packages\tensorflow\python\client\session.py", line 1514, in _make_callable_from_options
return BaseSession._Callable(self, callable_options)
File "C:\Users\nipun.gupta\Downloads\UniquePersonDeepSORT_2\venv\lib\site-packages\tensorflow\python\client\session.py", line 1473, in init
session._session, options_ptr)
tensorflow.python.framework.errors_impl.InvalidArgumentError: Requested tensor connection from unknown node: "input:0".

Kindly requesting for suggestions on resolving this exception. Thanks