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when running "tut_mission_B737_AVL.py",Spyder reported this error : " File "C:\Users\01376028\AppData\Local\Continuum\anaconda3\lib\subprocess.py", line 942, in _get_handles errwrite = msvcrt.get_osfhandle(stderr.fileno())

UnsupportedOperation: fileno " I don't know if I am not doing the right thing or what kind of problem, please help me. thanks~！