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langflow-ai / langflow

Langflow is a low-code app builder for RAG and multi-agent AI applications. It’s Python-based and agnostic to any model, API, or database.
http://www.langflow.org
MIT License
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Error running graph: list index out of range #4441

Open Chander88 opened 1 day ago

Chander88 commented 1 day ago

Bug Description

When I submit the request to on server. I got the response from API Error running graph: list index out of range.

Reproduction

Attached the screenshot.

Expected behavior

Please review screenshot.

Who can help?

@italojohnny

Operating System

ubuntu 22.04.1

Langflow Version

langflow 1.0.19. and langflow-base 0.0.99

Python Version

3.10

Screenshot

Screenshot from 2024-11-07 14-33-38

Flow File

No response

dosubot[bot] commented 1 day ago

Hey @Chander88, I'm here to help you with any bugs, questions, or contributions you have for the project. Let's tackle this together!

The "list index out of range" error typically occurs when trying to access an index in a list that doesn't exist. In Langflow, this could happen in several scenarios, especially during graph execution where lists are used to manage inputs, outputs, and vertices.

Here are some potential areas to investigate:

  1. Input and Output Lists: Ensure that the inputs and outputs provided to the graph are correctly defined and match the expected structure. If the graph expects a certain number of inputs or outputs, make sure they are all provided.

  2. Graph Structure: Check the graph's structure to ensure that all vertices and edges are correctly defined. Missing or incorrectly defined vertices could lead to attempts to access non-existent list elements.

  3. Code Handling Lists: Review the parts of the code that handle list operations during graph execution. Functions like find_runnable_predecessors_for_successors, get_top_level_vertices, and build_adjacency_maps are involved in list operations and could be potential sources of the error if they encounter unexpected data [1].

  4. Error Handling: Look into the error handling mechanisms in place during graph execution. The code includes several checks and exception handling that might provide more context on where the error is occurring [2].

If the error persists, consider adding logging or debugging statements to identify the exact point of failure in the code. This can help pinpoint which list operation is causing the issue.

To continue talking to Dosu, mention @dosu.

italojohnny commented 19 hours ago

Hello, @Chander88 . How are you?

To help you effectively, I first need to reproduce the issue on my end. Could you provide your flow and any additional information on the conditions I should set to encounter the same problem you’re experiencing?

Chander88 commented 18 hours ago

Hello @italojohnny,

Thankyou for helping. I am running two server one is Node and another is the Langflow. Basically it is the AI application and when I hitting the request to langflow server with some audio message. Langflow throws the error Error running graph: list index out of range. I use the flow Id that I got form the Python API when I dashboard of server.

Please let me know if any further details required.