Getting "TypeError: environment can only contain strings" on Windows 10

[RB61]

(base) D:\newwork\tkuanlun350\3DUnet-Tensorflow-Brats18-master>python preprocess.py
Processing HGG ...
0%| | 0/210 [00:00<?, ?it/s]
Traceback (most recent call last):
File "preprocess.py", line 77, in
main()
File "preprocess.py", line 56, in main
N4BiasFieldCorrect(mod_file, output_path)
File "preprocess.py", line 15, in N4BiasFieldCorrect
normalized.run()
File "C:\ProgramData\Miniconda3\lib\site-packages\nipype\interfaces\base\core.py", line 522, in run
runtime = self._run_interface(runtime)
File "C:\ProgramData\Miniconda3\lib\site-packages\nipype\interfaces\ants\segmentation.py", line 420, in _run_interface
runtime, correct_return_codes)
File "C:\ProgramData\Miniconda3\lib\site-packages\nipype\interfaces\base\core.py", line 1035, in _run_interface
runtime = run_command(runtime, output=self.terminal_output)
File "C:\ProgramData\Miniconda3\lib\site-packages\nipype\interfaces\base\core.py", line 773, in run_command
close_fds=(not sys.platform.startswith('win')),
File "C:\ProgramData\Miniconda3\lib\subprocess.py", line 709, in init
restore_signals, start_new_session)
File "C:\ProgramData\Miniconda3\lib\subprocess.py", line 997, in _execute_child
startupinfo)
TypeError: environment can only contain strings

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Seems to relate to Unicode being unsupported in Python
Any fix for this ?

[tkuanlun350]

Can you try to use Python3 to see if the problem still persists ?

[acumino]

Any update I am getting the same problem. Also python version is 3.7