TypeError: startswith first arg must be str or a tuple of str, not bytes

[handyworkz]

Traceback (most recent call last):
File "c:\Users\ADWIN\Documents\GitHub\Udacity ML\ud120-projects\datasets_questions\explore_enron_data.py", line 20, in
enron_data = joblib.load(open("C:/Users/ADWIN/Documents/GitHub/Udacity ML/ud120-projects/final_project/final_project_dataset.pkl", "r"))
File "C:\Users\ADWIN\anaconda3\envs\PyML3\lib\site-packages\joblib\numpy_pickle.py", line 647, in load
with _read_fileobject(fobj, filename, mmap_mode) as fobj:
File "C:\Users\ADWIN\anaconda3\envs\PyML3\lib\contextlib.py", line 135, in enter
return next(self.gen)
File "C:\Users\ADWIN\anaconda3\envs\PyML3\lib\site-packages\joblib\numpy_pickle_utils.py", line 149, in _read_fileobject
compressor = _detect_compressor(fileobj)
File "C:\Users\ADWIN\anaconda3\envs\PyML3\lib\site-packages\joblib\numpy_pickle_utils.py", line 100, in _detect_compressor
if first_bytes.startswith(_ZFILE_PREFIX):
TypeError: startswith first arg must be str or a tuple of str, not bytes

Whenever I run the explore_enron_data.py file I get this error and I dont know why
This is the code:

import joblib

enron_data = joblib.load(open("C:/Users/ADWIN/Documents/GitHub/Udacity ML/ud120-projects/final_project/final_project_dataset.pkl", "r"))