Import error when running fmm_test.py

[SwiftPredator]

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Describe the bug
I did a clean install of the fmm library on ubuntu inside a conda environment after some months of not using it. The python versions from installing and executing the test script match. However, i get the following error while importing fmm inside the python bindings:

Traceback (most recent call last):
File "/home/paul/repos/fmm/example/python/fmm_test.py", line 1, in
from fmm import Network,NetworkGraph,STMATCH,STMATCHConfig
File "/home/paul/anaconda3/envs/fmm/lib/python3.9/site-packages/fmm.py", line 15, in
import _fmm
ImportError: /lib/x86_64-linux-gnu/libp11-kit.so.0: undefined symbol: ffi_type_pointer, version LIBFFI_BASE_7.0

Maybe some mismatch in a dependent library version?

[Eric-Liu0526]

I found a solution that I believe will be helpful to anyone who uses fmm later on. The reason for this bug is that libffi versions are inconsistent. The reference link is https://blog.csdn.net/qq_38606680/article/details/129118491.