Unable to Open FinRL_PortfolioOptimizationEnv_Demo.ipynb – Invalid Notebook Error

Hi,
First of all, thank you for sharing this great project!
I've been using the FinRL_PortfolioOptimizationEnv_Demo.ipynb notebook recently, but for the past few days, I’ve been unable to open it on GitHub. I keep getting the following error message:
Invalid Notebook
There was an error rendering your Notebook: the 'state' key is missing from 'metadata.widgets'. Add 'state' to each, or remove 'metadata.widgets'.
It seems the notebook's metadata might have become corrupted or incompatible with the GitHub viewer.
Would you mind re-uploading a clean or fixed version of the notebook? I’d really appreciate it, as it’s been very helpful in my work.
Thanks again for your time and great contribution!