Jupyterlab-hub install failure after Jupyterlab Beta 2 upgrade

[tiggerntatie]

Upon upgrading to Jupyterlab Beta 2, found I needed to reinstall the Jupyterlab-hub, but could not:

sudo jupyter labextension install @jupyterlab/hub-extension
> /usr/local/bin/npm pack @jupyterlab/hub-extension
jupyterlab-hub-extension-0.8.1.tgz

Errored, use --debug for full output:
TypeError: the JSON object must be str, not 'bytes'

[dacowan]

+1

[ghost]

I get the same result. Full debug output is: `

jupyterlab-hub-extension-0.8.1.tgz

Fetching URL: https://registry.npmjs.org/@jupyterlab%2Fhub-extension Traceback (most recent call last):   File "/opt/conda/lib/python3.5/site-packages/jupyterlab/labextensions.py", line 71, in start ans = self.run_task()   File "/opt/conda/lib/python3.5/site-packages/jupyterlab/labextensions.py", line 100, in run_task for arg in self.extra_args   File "/opt/conda/lib/python3.5/site-packages/jupyterlab/labextensions.py", line 100, in for arg in self.extra_args   File "/opt/conda/lib/python3.5/site-packages/jupyterlab/commands.py", line 227, in install_extension return handler.install_extension(extension)   File "/opt/conda/lib/python3.5/site-packages/jupyterlab/commands.py", line 366, in install_extension info = self._install_extension(extension, tempdir)   File "/opt/conda/lib/python3.5/site-packages/jupyterlab/commands.py", line 1138, in _install_extension version = self._latest_compatible_package_version(name)   File "/opt/conda/lib/python3.5/site-packages/jupyterlab/commands.py", line 1202, in _latest_compatible_package_version metadata = _fetch_package_metadata(self.registry, name, self.logger)   File "/opt/conda/lib/python3.5/site-packages/jupyterlab/commands.py", line 1588, in _fetch_package_metadata return json.load(response)   File "/opt/conda/lib/python3.5/json/init.py", line 268, in load parse_constant=parse_constant, object_pairs_hook=object_pairs_hook, **kw)   File "/opt/conda/lib/python3.5/json/init.py", line 312, in loads s.class.name))   TypeError: the JSON object must be str, not 'bytes'

`

[liffiton]

Just installed fine for me with jupyterlab-hub-extension-0.9.0.tgz.

jupyter --version     -> 4.4.0
jupyterhub --version  -> 0.8.1
jupyter-lab --version -> 0.32.0

Looks like it was fixed in #53 and someone pushed a new version 0.9.0 to npm.