I am getting this error while i was working on SubQuest...

ssriani

@kapa.ai I am getting this error while i was working on SubQuestionQueryEngine Following is the trace:
IndexError Traceback (most recent call last)

File /Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/site-packages/llama_index/response_synthesizers/base.py:119, in BaseSynthesizer.synthesize(self, query, nodes, additional_source_nodes)
113 def synthesize(
114 self,
115 query: QueryTextType,
116 nodes: List[NodeWithScore],
117 additional_source_nodes: Optional[Sequence[NodeWithScore]] = None,
118 ) -> RESPONSE_TYPE:
--> 119 event_id = self._callback_manager.on_event_start(CBEventType.SYNTHESIZE)
121 if isinstance(query, str):
122 query = QueryBundle(query_str=query)

File /Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/site-packages/llama_index/callbacks/base.py:91, in CallbackManager.on_event_start(self, event_type, payload, event_id, **kwargs)
89 """Run handlers when an event starts and return id of event."""
90 event_id = event_id or str(uuid.uuid4())
---> 91 self._trace_map[self._trace_stack[-1]].append(event_id)
92 for handler in self.handlers:
93 if event_type not in handler.event_starts_to_ignore:

IndexError: list index out of range

12 comments

kkapa.ai

Please stand by @sriani as I search the knowledge base. We are experiencing especially high traffic right now and might take longer than usual. :wave:

ssriani

FYI @Logan M

ssriani

@Logan M Do you know what is going on here?

kkapa.ai

----------------------
The error you're encountering is an IndexError: list index out of range which is occurring in the CallbackManager class of the LlamaIndex library. This error typically happens when you're trying to access an index that doesn't exist in a list.

From the traceback, it seems like the error is happening at this line of code:

Plain Text

self._trace_map[self._trace_stack[-1]].append(event_id)

Here, self._trace_stack[-1] is trying to access the last element of the list self._trace_stack. If self._trace_stack is an empty list, this would result in an IndexError because there's no element to access.

Unfortunately, the provided extracts do not contain enough information to diagnose why self._trace_stack is empty. It could be due to a variety of reasons, such as not properly initializing the CallbackManager or not correctly using it within the SubQuestionQueryEngine.

I would recommend revisiting the setup of your CallbackManager and SubQuestionQueryEngine and ensuring they align with the examples provided in the LlamaIndex documentation. Here is an example of how to set up a CallbackManager:

Plain Text

from llama_index.callbacks import CallbackManager, LlamaDebugHandler

llama_debug = LlamaDebugHandler(print_trace_on_end=True)
callback_manager = CallbackManager([llama_debug])

And here is an example of how to set up a SubQuestionQueryEngine:

Plain Text

from llama_index.query_engine import SubQuestionQueryEngine

query_engine = SubQuestionQueryEngine.from_defaults(query_engine_tools=query_engine_tools)

If the issue persists, you may want to reach out to the maintainers of the LlamaIndex library for further assistance.
----------------------
Note: you can ask me a follow up question by @ mentioning me again :speech_balloon:
----------------------

ssriani

@kapa.ai
File /Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/site-packages/llama_index/indices/query/base.py:23, in BaseQueryEngine.query(self, str_or_query_bundle)
21 if isinstance(str_or_query_bundle, str):
22 str_or_query_bundle = QueryBundle(str_or_query_bundle)
---> 23 response = self._query(str_or_query_bundle)
24 return response

File /Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/site-packages/llama_index/query_engine/sub_question_query_engine.py:147, in SubQuestionQueryEngine._query(self, query_bundle)
140 self.callback_manager.on_event_end(
141 CBEventType.SUB_QUESTIONS,
142 payload={EventPayload.SUB_QUESTIONS: qa_pairs},
143 event_id=event_id,
144 )
146 nodes = [self._construct_node(pair) for pair in qa_pairs]
--> 147 return self._response_synthesizer.synthesize(
148 query=query_bundle,
149 nodes=nodes,
150 )
The initial part of the logs

kkapa.ai

Let me check the knowledge base for you. One moment! :books:

kkapa.ai

----------------------
From the provided traceback, it seems like the error is occurring in the SubQuestionQueryEngine._query method, specifically at the line where it calls self._response_synthesizer.synthesize. However, without the actual error message or the rest of the traceback, it's hard to diagnose the exact issue.

The SubQuestionQueryEngine._query method is responsible for breaking down a complex query into sub-questions, executing these sub-questions, and then synthesizing the responses into a final response. The synthesize method is part of the ResponseSynthesizer class, which is responsible for synthesizing the final response from the sub-question responses.

Here's a simplified version of what the SubQuestionQueryEngine._query method does:

Plain Text

def _query(self, query_bundle):
    # Generate sub-questions
    qa_pairs = self._generate_sub_questions(query_bundle)

    # Execute sub-questions and construct nodes
    nodes = [self._construct_node(pair) for pair in qa_pairs]

    # Synthesize final response
    return self._response_synthesizer.synthesize(
        query=query_bundle,
        nodes=nodes,
    )

If you're encountering an error at the synthesize line, it could be due to a variety of reasons. For example, there might be an issue with the ResponseSynthesizer instance, the query_bundle argument, or the nodes argument.

To debug this issue, you could try the following steps:

Check the ResponseSynthesizer instance: Make sure that the ResponseSynthesizer instance (self._response_synthesizer) is correctly initialized and configured.

Check the query_bundle argument: Make sure that the query_bundle argument is a valid QueryBundle instance.

Check the nodes argument: Make sure that the nodes list contains valid NodeWithScore instances.

kkapa.ai

LLogan M

that's... concerning. Does this happen every time, or only sometimes?

ssriani

Yeah it keeps happening

ssriani

File "/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/site-packages/llama_index/indices/query/base.py", line 23, in query
response = self._query(str_or_query_bundle)
File "/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/site-packages/llama_index/query_engine/sub_question_query_engine.py", line 147, in _query
return self._response_synthesizer.synthesize(
File "/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/site-packages/llama_index/response_synthesizers/base.py", line 119, in synthesize
event_id = self._callback_manager.on_event_start(CBEventType.SYNTHESIZE)
File "/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/site-packages/llama_index/callbacks/base.py", line 91, in on_event_start
self._trace_map[self._trace_stack[-1]].append(event_id)
IndexError: list index out of range

LLogan M

Do you mind sharing your code?

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I am getting this error while i was working on SubQuestionQueryEngine Following is the tra