as I start develop version under jupyterhub, it reports in log and fails:
Starting under Jupyterhub
fatal: destination path '/notebooks' already exists and is not an empty directory.
Traceback (most recent call last):
File "/root/miniconda/envs/jupyterhub_py3/bin/jupyterhub-singleuser", line 21, in <module>
import notebook
ImportError: No module named 'notebook'
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "/root/miniconda/envs/jupyterhub_py3/bin/jupyterhub-singleuser", line 23, in <module>
raise ImportError("JupyterHub single-user server requires notebook >= 4.0")
ImportError: JupyterHub single-user server requires notebook >= 4.0
as I start develop version under jupyterhub, it reports in log and fails: