Config File Errors

Hi, not so long ago I built a chatbot in RASA v.1.9.0 and it was working fine on my older system. I was trying to set it up on another system but failed to do so. When I run rasa train I get the following error:

rasa.core.policies.ensemble.InvalidPolicyConfig: Module for policy 'MemoizationPolicy' could not be loaded. Please make sure the name is a valid policy.

Any suggestions how to debug this. My rasa version is 1.9.0 and python 3.6.9 on both systems.

Hi @taimoor-ahmed, can you share your config.yml?