Jupyter启动报错：AttributeError: type object ‘IOLoop‘ has no attribute ‘initialized‘

Traceback (most recent call last):
  File "D:APPAnacondaenvstorchScriptsjupyter-notebook-script.py", line 3, in 
    import notebook.notebookapp
  File "D:APPAnacondaenvstorchlibsite-packagesnotebooknotebookapp.py", line 40, in 
    ioloop.install()
  File "D:APPAnacondaenvstorchlibsite-packageszmqeventloopioloop.py", line 210, in install
    assert (not ioloop.IOLoop.initialized()) or 
AttributeError: type object 'IOLoop' has no attribute 'initialized'

个人的虚拟环境是Python3.6

conda install tornado=4.5

我自己尝试的是这个，下面的升级版本没成功；

我安装这个之后，jupyter可以打开，但是环境启动不起来，python环境丢失了

conda install -c anaconda pyzmq

两种都尝试一下，先1后2，因个人环境不同，有点差异！