在anaconda搭建的mxnet环境下运行notbook报错。

Question

Traceback (most recent call last):
File "D:\anaconda3\envs\mxnet\Scripts\jupyter-lab-script.py", line 5, in 
from jupyterlab.labapp import main
File "D:\anaconda3\envs\mxnet\lib\site-packages\jupyterlab\labapp.py", line 14, in 
from jupyterlab_server import slugify, WORKSPACE_EXTENSION
File "D:\anaconda3\envs\mxnet\lib\site-packages\jupyterlab_server\__init__.py", line 4, in 
from .app import LabServerApp
File "D:\anaconda3\envs\mxnet\lib\site-packages\jupyterlab_server\app.py", line 9, in 
from .server import ServerApp
File "D:\anaconda3\envs\mxnet\lib\site-packages\jupyterlab_server\server.py", line 20, in 
from notebook.notebookapp import aliases, flags, NotebookApp as ServerApp
File "D:\anaconda3\envs\mxnet\lib\site-packages\notebook\notebookapp.py", line 40, in 
ioloop.install()
File "D:\anaconda3\envs\mxnet\lib\site-packages\zmq\eventloop\ioloop.py", line 210, in install
assert (not ioloop.IOLoop.initialized()) or \
AttributeError: type object 'IOLoop' has no attribute 'initialized'