Issues with perspective-python examples

[BattosaiX]

Hi - I just discovered perspective and I'm trying to play around with it
I am unable to run the python streaming examples provided in the webpage
(from here: https://github.com/sc1f/streaming-perspective-jupytercon-2020)
I am receiving two major errors so far
Even though I suspect it has to do with differences in versions, I have been so far not able to figure out the issue
First error at line 16 from "perspective_basics.ipynb"

Full error:

[Open Browser Console for more detailed log - Double click to close this message]
Failed to load model class 'PerspectiveModel' from module '@finos/perspective-jupyterlab'
Error: No version of module @finos/perspective-jupyterlab is registered
at f.loadClass (http://localhost:8888/lab/extensions/@jupyter-widgets/jupyterlab-manager/static/134.40eaa5b8e976096d50b2.js?v=40eaa5b8e976096d50b2:1:74856)
at f.loadModelClass (http://localhost:8888/lab/extensions/@jupyter-widgets/jupyterlab-manager/static/150.b0e841b75317744a7595.js?v=b0e841b75317744a7595:1:10729)
at f._make_model (http://localhost:8888/lab/extensions/@jupyter-widgets/jupyterlab-manager/static/150.b0e841b75317744a7595.js?v=b0e841b75317744a7595:1:7517)
at f.new_model (http://localhost:8888/lab/extensions/@jupyter-widgets/jupyterlab-manager/static/150.b0e841b75317744a7595.js?v=b0e841b75317744a7595:1:5137)
at f.handle_comm_open (http://localhost:8888/lab/extensions/@jupyter-widgets/jupyterlab-manager/static/150.b0e841b75317744a7595.js?v=b0e841b75317744a7595:1:3894)
at _handleCommOpen (http://localhost:8888/lab/extensions/@jupyter-widgets/jupyterlab-manager/static/134.40eaa5b8e976096d50b2.js?v=40eaa5b8e976096d50b2:1:73393)
at b._handleCommOpen (http://localhost:8888/static/lab/jlab_core.4d5114e25256eeddf4e4.js?v=4d5114e25256eeddf4e4:2:1039655)
at async b._handleMessage (http://localhost:8888/static/lab/jlab_core.4d5114e25256eeddf4e4.js?v=4d5114e25256eeddf4e4:2:1041645)

Then line 17

Would greatly appreciate your help