Error Importing `tethys_command` When Installing Tethys in Editable Mode

[Sonia-96]

If I install tethys with pip install -e ., I will the following error when I run tethys manage start:

Traceback (most recent call last):
  File "/home/tethys/miniconda3/envs/tethys/bin/tethys", line 5, in <module>
    from tethys_cli import tethys_command
ImportError: cannot import name 'tethys_command' from 'tethys_cli' (unknown location)

But it works fine if I use pip install . to install tethys.