No module named rasa_sdk when trying to write custom action in actions.py

Hi, I also ran into similar problem, rasa --version Rasa Version : 3.6.0 Minimum Compatible Version: 3.5.0 Rasa SDK Version : 3.6.0 Python Version : 3.8.10 Operating System : Linux-5.15.0-75-generic-x86_64-with-glibc2.29 Python Path : , I created a virtual environment in Ubuntu with python 3.8.10 used for the environment. Any time i have ran the custom actions,py , i ran into the problem. Any help would welcome.