NoEligibleSpeaker: Custom speaker selection function returned None. Terminating conversation.

[thrishathi02]

This is the code that I'm using, and it gives me a error which says : "NoEligibleSpeaker: Custom speaker selection function returned None. Terminating conversation.". Please help.

def state_transition(last_speaker, groupchat):
messages = groupchat.messages
last_message = messages[-1] if messages else {}

if len(messages) == 1:
    log_agent_activity(f"1st Speaker Name: {last_speaker.name}. Start the agent now.")

else:
    log_agent_activity(f"Current Speaker Name: {last_speaker.name}. Proceeding with Execution.")

if last_speaker is user_proxy:
    if len(messages) == 1:
        log_agent_activity(f"Last Speaker Name: {last_speaker.name} :: Current Speaker Name: Planner Start")
        return planner
    else:
        log_agent_activity(f"Last Speaker Name: {last_speaker.name} :: Current Speaker Name: Retrieval Start")
        return retrieval

elif last_speaker is planner:
    if "terminate-flow" in last_message.get("content", "").lower():
        return terminator
    return retrieval

elif last_speaker is retrieval:
    if "terminate-agent" in last_message.get("content", "").lower():
        return answer_generator
    elif "terminate-flow" in last_message.get("content", "").lower():
        return terminator
    return retrieval  

elif last_speaker is answer_generator:
    if "terminate-agent" in last_message.get("content", "").lower():
        return critic
    elif "terminate-flow" in last_message.get("content", "").lower():
        return terminator
    return answer_generator  

elif last_speaker is critic:
    if "all-good" in last_message.get("content", "").lower():
        log_agent_activity(f"Last Speaker Name: {last_speaker.name} :: Current Speaker Name: Terminator Start")
        return terminator   
    else:
        return retrieval  

elif last_speaker is terminator:
    log_agent_activity(f"Last Speaker Name: {last_speaker.name} :: Conversation Ended")
    return None  

[thrishathi02]

I'm using V0.2 btw

[Reeyaku]

I'm facing similar problems

[thrishathi02]

@ekzhu, any idea on why this could be happening?

I'm using a similar method for state transition in another project, this error doesn't occur there at all.

[ekzhu]

The custom speaker selection function returns None in the last if statement. Can you check?

[ekzhu]

If you want to termination based on conversation history rather than relying on agent to terminate, please upgrade to v0.4 and use SourceMatchTermination for your scenario.

[thrishathi02]

According to this documentation : https://microsoft.github.io/autogen/0.2/blog/2024/02/29/StateFlow/

A None can be returned to end the workflow, has this changed?

[ekzhu]

Yes it has been changed. Please see the SelectorGroupChat user guide regarding custom selector function: https://microsoft.github.io/autogen/dev/user-guide/agentchat-user-guide/selector-group-chat.html#custom-selector-function

and API doc: https://microsoft.github.io/autogen/dev/reference/python/autogen_agentchat.teams.html#autogen_agentchat.teams.SelectorGroupChat