QUANTCONNECT COMMUNITY
Hi!
I installed lean cli and phyton successfully, but when I try to backtest my project I'm getting error:
PS C:\Projects\quantconnect> lean backtest "myfirstproject"
Usage: lean [OPTIONS] COMMAND [ARGS]...
Try 'lean --help' for help.
Error: No such command 'backtest'.
PS C:\Projects\quantconnect>
Please help, what I'm missing?
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Juan C.
I think you have a old version of Python or/and Lean,
Can you write:
 and
in your CMD shell?
Maryana
I just installed them yesterday,
PS C:\Projects\quantconnect> lean --version
lean, version 0.1.2
PS C:\Projects\quantconnect> python --version
Python 3.10.5
PS C:\Projects\quantconnect>
Â
Juan C.
Python version is ok, but lean version is very old, I dont know why,Â
I recommend you first install conda environment  https://conda.io and later install Lean over it (that is the recommended by quantconnect) , its works for me, otherwise you can have problems about dependences
Alexandre Catarino
Hi Maryana ,
Please upgrade Lean-CLI to its latest version (thank you, Juan C.):
pip install --upgrade lean
and downgrade python to version 3.9.x. There is a known issue with Docker and python 3.10. We will add this issue to Lean-CLI docs.
Best regards,
Alex
Maryana
The material on this website is provided for informational purposes only and does not constitute an offer to sell, a solicitation to buy, or a recommendation or endorsement for any security or strategy, nor does it constitute an offer to provide investment advisory services by QuantConnect. In addition, the material offers no opinion with respect to the suitability of any security or specific investment. QuantConnect makes no guarantees as to the accuracy or completeness of the views expressed in the website. The views are subject to change, and may have become unreliable for various reasons, including changes in market conditions or economic circumstances. All investments involve risk, including loss of principal. You should consult with an investment professional before making any investment decisions.
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