### relocate postgres db, if you're not using your root disk
### [relocate postgres db, if you're not using your root disk](https://www.digitalocean.com/community/tutorials/how-to-move-a-postgresql-data-directory-to-a-new-location-on-ubuntu-18-04)
## change the configuration of the desired otree server with all installed instances
After setting your desired configuration you are ready to run the playbook.
...
...
@@ -107,8 +107,8 @@ otree_users:
### I see "TypeError: __init__() missing 1 required positional argument: 'on_delete'"?
Most likely an older otree version has to be configured. Set ``otree==<desired_version>`` in ``requirements_base.txt``. Since Django 2.0 the "on_delete" parameter is required in a model and needs to be added in your code or in the included apps (e.g otree-tools).
### I see "ModuleNotFoundError: No module named '<someexperimentname>'"?
Remove the definition in variable ``SESSION_CONFIGS`` from ``settings.py``.
### I see "ModuleNotFoundError: No module named '``<someexperimentname>``'"?
Remove the definition in variable ``SESSION_CONFIGS`` from ``settings.py```or add the corresponding code to your otree project.
### I see "ModuleNotFoundError: No module named 'otree_tools'"?
Add ``otree_tools==<desired_version>`` in ``requirements_base.txt``.