cannot import name 'decode_modified_utf8' from partially initialized module 'mutf8' (most likely due to a circular import)

[eatingallday]

when I execute the code:

python3 droidstatx.py --apk ./benchmark-apks/MSTG-Android-Java.apk

it turns out:
Traceback (most recent call last):
File "droidstatx.py", line 5, in
from App import App
File "/app/App.py", line 2, in
from androguard.misc import AnalyzeAPK
ModuleNotFoundError: No module named 'androguard'

so I try

export $PYTHONPATH = /path/to/androguard

to fix this problem, and another circular import error happens:
File "/home/layang/tools/droidstatx-master/androguard/androguard/core/bytecode.py", line 8, in
from androguard.core.dex.dex_types import Kind, Operand
File "/home/layang/tools/droidstatx-master/androguard/androguard/core/dex/init.py", line 21, in
from androguard.core import mutf8
File "/home/layang/tools/droidstatx-master/androguard/androguard/core/mutf8/init.py", line 7, in
from mutf8 import decode_modified_utf8, encode_modified_utf8
File "/home/layang/tools/droidstatx-master/androguard/androguard/core/mutf8/init.py", line 7, in
from mutf8 import decode_modified_utf8, encode_modified_utf8
ImportError: cannot import name 'decode_modified_utf8' from partially initialized module 'mutf8' (most likely due to a circular import) (/home/layang/tools/droidstatx-master/androguard/androguard/core/mutf8/init.py)

why is this happens and how to fix this error