Issues on Google Colab

[lmerchante]

Dear team,
I'm runing gym environment from SethKitchen (https://github.com/SethKitchen/hearthstone-gym). It uses fireplace and hearthstone packages. Running it locally (python 3.9) it works like a charm. I'm trying to run on Google Colab (python 3.8) and it fails when importing cardxml. However, other modules are properly imported:

I have no idea what is going wrong. Could you give me a hand please?