Hi there,

Enclosed please find a text from my Windows PowerShell. I followed a very basic tutorial of yours and try to run one of the default games you have there, but an unexpected error message is showing up every time, although I followed the instructions very carefully. 

Basically all I did is define the path, open a new otree project and run it. Here is the sequence of the things (from Windows PowerShell):

PS C:\Users\eden2\Desktop\otree1\edenproject> cd C:\Users\eden2\Desktop\otree1
PS C:\Users\eden2\Desktop\otree1> otree startproject testproject
Include sample games? (y or n): y
Created project folder.
Enter "cd testproject" to move inside the project folder, then start the server with "otree devserver".
PS C:\Users\eden2\Desktop\otree1> cd testproject
PS C:\Users\eden2\Desktop\otree1\testproject> otree devserver
Traceback (most recent call last):
  File "C:\Users\eden2\AppData\Local\Programs\Python\Python39\Scripts\otree-script.py", line 33, in <module>
    sys.exit(load_entry_point('otree==5.8.4', 'console_scripts', 'otree')())
  File "c:\users\eden2\appdata\local\programs\python\python39\lib\site-packages\otree\main.py", line 108, in execute_from_command_line
    setup()
  File "c:\users\eden2\appdata\local\programs\python\python39\lib\site-packages\otree\main.py", line 137, in setup
    init_i18n(settings.LANGUAGE_CODE_ISO)
AttributeError: module 'otree.settings' has no attribute 'LANGUAGE_CODE_ISO' 

I'll be so happy if you could reply to this one and let me know what I did wrong. 

Thanks in advance,
Eden Heilprin

This is an interesting one. First, run this:

pip3 uninstall otree
pip3 install otree

Then try running devserver again.

If you still get the error, run "python" to get the Python command prompt, then do:

>>> import otree.settings
>>> otree.settings.__file__

This will output a file path. Find the file at that path, and post that file as an attachment here.

Also, in the Python command prompt, do this:

dir(otree.settings)

And post the output here.