TypeError: unicode argument expected, got 'str'

[rutiruru]

Hi, i'm so new to github and been trying to implement voxnet these days but i got some problems.
not sure if it'll be too late to ask questions.

i've set up all enviroment in anaconda3 as below:
python 2.7.18
numpy 1.16.6
lasagne 0.2 (i upgraded to 0.2 since there was error in 0.1 version)
theono 0.9.0
scipy 1.2.1
scikit-learn 0.20.3
path 15.0.1
pip 19.3.1

I downloaded 3DShapeNets and unzipped it under the scritpts file already.
so far im trying the python convert_shapenet10.py 3DShapeNets.
But it shows TypeError: unicode argument expected, got 'str' in format.py file from virtual enviroment:

File "C:\Users\ruti\anaconda3\envs\VoxNet_2\lib\site-packages\numpy\lib\format.py", line 383, in _write_array_header
fp.write(header_prefix)
TypeError: unicode argument expected, got 'str

Do you know anything about this problem?
it'll be great if i can get some advises. Thanks!