"ipcluster nbextension enable" doesn't have subcommand specified

Question

I have ipyparallel 5.3.0. Its official doc, https://github.com/ipython/ipyparallel#install, instructs the following:

To enable the IPython Clusters tab in Jupyter Notebook:

ipcluster nbextension enable

But I got the following issue hence it didn't work.

No subcommand specified. Must specify one of: ['start', 'stop', 'engines'].

I did more checks following minrk's tips.

$ipcluster --version
5.2.0

$which -a ipcluster
/home/etlolap/anaconda3/bin/ipcluster
/user/bin/cluster

$head -n 1 $(which ipcluster)
#!/home/etlolap/anaconda3/bin/python

Everything looks fine though.

Answer 1

For all users with root/admin access :

sudo jupyter serverextension enable --py ipyparallel
sudo jupyter nbextension install --py ipyparallel
sudo jupyter nbextension enable --py ipyparallel

Don't forget to start it by :

ipcluster start

Answer 2

That suggests that ipcluster doesn't point to the version you expect to have installed. What do you see for:

ipcluster --version

? You might also check if there's more than one installed with:

which -a ipcluster

You can also verify that the ipcluster command is started with the Python you expect with:

head -n 1 $(which ipcluster)

If there is some confusion of package versions, it can help to remove and reinstall the package. Repeat:

pip uninstall ipyparallel

Until it says there is no ipyparallel package found, then install again with:

pip install --upgrade ipyparallel

Answer 3

For anyone facing this issue, try on your terminal :

jupyter serverextension enable --py ipyparallel --user
jupyter nbextension install --py ipyparallel --user 
jupyter nbextension enable --py ipyparallel --user

It worked just fine for me, I had the same command problem and everything seemed well installed (ipcluster version, python version...).

The issue was also debated on IPython's Github if you need further information : https://github.com/ipython/ipyparallel/issues/170