Rasa migration from version 2.x to 3.1

While migrating domain file from rasa version 2 to 3.1 with the command “rasa data migrate -d DOMAIN --out OUT_PATH”, I am facing the following error in screenshot. Could you suggest how to resolve this.

Looks like this is related to a list of slots in a form. Try running rasa data validate on the 2.0 version of the domain file.