AttributeError: module 'flask.json' has no attribute 'JSONEncoder'

[Sububioinfo]

Hi,
I am getting the following error while testing your example data
(cxg) [root@master excellxgene]# excellxgene launch example-dataset
Traceback (most recent call last):
File "/root/.conda/envs/cxg/bin/excellxgene", line 5, in
from backend.server.cli.cli import cli
File "/root/.conda/envs/cxg/lib/python3.8/site-packages/backend/server/init.py", line 3, in
from backend.common.utils.utils import import_plugins
File "/root/.conda/envs/cxg/lib/python3.8/site-packages/backend/common/utils/utils.py", line 68, in
class Float32JSONEncoder(json.JSONEncoder):
AttributeError: module 'flask.json' has no attribute 'JSONEncoder'