- no module named jupyter_core

Morning, all! I’m having an issue with Salamander - every time I launch my server, I get the following message while waiting for it to start up:

Waiting for Jupyter Notebook to start…
Traceback (most recent call last):
File “/home/ubuntu/anaconda3/bin/jupyter”, line 7, in
from jupyter_core.command import main
ModuleNotFoundError: No module named ‘jupyter_core’

Any ideas what I can do to resolve?