Error when programmatically training

Hi,
I’m getting error when programatically training the agents.

Error:
TypeError: Can’t instantiate abstract class BaseKnowledgeSource with abstract methods add, validate_content

My code:

from crews.support_crew_frontdesk.support_crew_frontdesk import SupportCrewFrontDesk

n_iterations = 2
inputs = {“topic”: “Como posso aumentar a eficiencia de meu veículo?”}
filename = “crew_frontdesk.pkl”

try:
SupportCrewFrontDesk().crew().train(
n_iterations=n_iterations,
inputs=inputs,
filename=filename
)

except Exception as e:
raise Exception(f"An error occurred while training the crew: {e}")

Does anyone know what might be happening? What am I doing wrong?