title: Problem displaying widgets / ipywidgets install unsuccessful
body: <p>I'm implementing widgets in my jupyter notebook (via anaconda). I tried first by using an old code from a professor of mine, but it's not displaying widgets.</p>
  
  <p>I tried installing:</p>
  
  <blockquote>
    <p>jupyter labextension install @jupyter-widgets/jupyterlab-manager</p>
  </blockquote>
  
  <p>But it was unsuccessful</p>
  
  <p>This was presented when I attempted installation of the package via windows command prompt:</p>
  
  <blockquote>
    <p>C:\Users\davio>jupyter labextension install @jupyter-widgets/jupyterlab-manager</p>
    
    <p>Traceback (most recent call last):   File
    "C:\Users\davio\Anaconda3\lib\site-packages\jupyterlab_server\server.py",
    line 14, in 
        from notebook.base.handlers import (   File "C:\Users\davio\Anaconda3\lib\site-packages\notebook\base\handlers.py",
    line 30, in 
        from tornado import web, gen, escape, httputil   File "C:\Users\davio\Anaconda3\lib\site-packages\tornado\web.py", line 87,
    in 
        from tornado.httpserver import HTTPServer   File "C:\Users\davio\Anaconda3\lib\site-packages\tornado\httpserver.py",
    line 29, in 
        import ssl   File "C:\Users\davio\Anaconda3\lib\ssl.py", line 98, in 
        import _ssl             # if we can't import it, let the error propagate ImportError: DLL load failed: The specified procedure could
    not be found.</p>
  </blockquote>
  
  <p>During handling of the above exception, another exception occurred:</p>
  
  <blockquote>
    <p>Traceback (most recent call last):   File
    "C:\Users\davio\Anaconda3\Scripts\jupyter-labextension-script.py",
    line 6, in 
        from jupyterlab.labextensions import main   File "C:\Users\davio\Anaconda3\lib\site-packages\jupyterlab\labextensions.py",
    line 16, in 
        from .commands import (   File "C:\Users\davio\Anaconda3\lib\site-packages\jupyterlab\commands.py",
    line 27, in 
        from jupyterlab_server.process import which, Process, WatchHelper   File
    "C:\Users\davio\Anaconda3\lib\site-packages\jupyterlab_server__init__.py",
    line 4, in 
        from .app import LabServerApp   File "C:\Users\davio\Anaconda3\lib\site-packages\jupyterlab_server\app.py",
    line 9, in 
        from .server import ServerApp   File "C:\Users\davio\Anaconda3\lib\site-packages\jupyterlab_server\server.py",
    line 26, in 
        from jupyter_server.base.handlers import (                          # noqa ModuleNotFoundError: No module named 'jupyter_server'</p>
  </blockquote>
  
  <p>I expect to:</p>
  
  <p>i) Be able to install all the required ipy packages in order to display widgets properly</p>
  
  <p>ii) View and manipulate widgets properly
  Thank you!!!!</p>