when I run the following code:

```
import geopandas as gpd
from shapely.geometry import Point, Polygon
import pandas as pd

gpd.io.file.fiona.drvsupport.supported_drivers['KML'] = 'rw'
my_map = gpd.read_file('mymap.kml', driver='KML')
my_map

```

I get this error:

```
    gpd.io.file.fiona.drvsupport.supported_drivers['KML'] = 'rw'
AttributeError: 'NoneType' object has no attribute 'drvsupport'

```

Can anyone please help to solve this issue?