@M-PERSIC I restart the jupyter notebook, and run the following code again:
using Pkg; Pkg.add("Conda")
using Conda
Conda.add("geopandas")
The error changed again. It said I already installed geopandas, but when I import geopandas, it said geopandas not found.
Besides, do you know how to resolve this error–AttributeError(“module ‘geopandas’ has no attribute ‘plotting’”)? It is showed in the following picture.