An exception has occured

[olliemay]

Hello, I'm new to python and to plotly. I'm trying to generate a 3D surface plot from data generated froma series of FTIR scans. I've installed the libraries using conda in an environment on my Mac. I can run the hello world example in jupyter lab but copying a new example from the plotly dash website (https://dash.plot.ly/interactive-graphing) to figure out how the code works i get the following error?

Running on http://127.0.0.1:8050/
Debugger PIN: 708-478-825

• Serving Flask app "main" (lazy loading)
• Environment: production
  WARNING: This is a development server. Do not use it in a production deployment.
  Use a production WSGI server instead.
• Debug mode: on
  An exception has occurred, use %tb to see the full traceback.

SystemExit: 1
/usr/local/miniconda3/lib/python3.6/site-packages/IPython/core/interactiveshell.py:3333: UserWarning:

To exit: use 'exit', 'quit', or Ctrl-D.

Re-runing the hello world example I then get the error that the address is already in use - suggesting that the server is running?

opening chrome with http://127.0.0.1:8050/ just gives a blank page thta keeps trying to update.

Also if i try ploting with plotly the code runs and space for the plot appears undernether the code but no plot is rendered?

Thanks,
Ollie