Unable to avoid below error

Hello OCP team, I have a question about tutorial.
In the Ocp calculator tutorial, I get an error like the attached image. How can I avoid this?

Sorry for my poor English.

Hi -

Any chance you can provide me with the script/code you’re using that resulted in this error. When I run something like this on my end I’m not able to reproduce this:

calc = OCPCalculator(

Where the checkpoint is found here - ocp/MODELS.md at main · Open-Catalyst-Project/ocp · GitHub.

I would also make sure you’re on the latest branch for the repo.

thank you for your reply.
I will check it.