Has anyone completed this Agentforce module - "Author Your Agent Using Agent Script" ??? Facing one error and did everything I could but it isn't getting resolved.

Error :  

Something went wrong. Please try again.

ensure the 'default_agent_user' set, is valid, and has the required permission sets assigned ['AgentforceServiceAgentBase', 'AgentforceServiceAgentUser', 'EinsteinGPTPromptTemplateUser'] 

Whenever I preview agent in VS-Code and start live test, this error pops up. Only permission with exact name from above present in org is - "AgentforceServiceAgentUser" which is assigned to agent user. Other two permission sets with exact names don't exist in org and it's an org created through link provided in module only. 

Does anyone has any solution for this ???  Kindly share!