Hi Than Htut Aye,
Recently there were some requirement updates on Open edX's configuration branch that bumped the Ansible version to 2.5.15.
The issue is happening because you are running playbooks that use
ec2_metadata_facts on an ansible version that doesn't have that command.
To fix for that you can try to update the virtualenv's requirements running this command just before running the playbook:
make requirements
If you keep getting this issue after updating the requirements, post a few more details about your setup (like Open edX release, in which cloud are you deploying, etc.) so that we can help you. :)
Regards,
Giovanni from OpenCraft