It seems that the latest version of jupyterlab, 0.35, is not supported due to conflicting package versions.
ValueError: This extension does not yet support the current version of JupyterLab.
Conflicting Dependencies:
JupyterLab Extension Package
>=0.19.1 <0.20.0 >=0.18.4 <0.19.0 @jupyterlab/application
>=0.19.1 <0.20.0 >=0.18.4 <0.19.0 @jupyterlab/apputils
>=0.19.2 <0.20.0 >=0.18.4 <0.19.0 @jupyterlab/notebook
It seems that the latest version of jupyterlab,
0.35
, is not supported due to conflicting package versions.