langflow-ai/langflow · error · HTTPException

Internal error creating knowledge base

Error message

Internal error creating knowledge base

What it means

Error "Internal error creating knowledge base" thrown in langflow-ai/langflow.

Source

Thrown at src/backend/base/langflow/api/v1/knowledge_bases.py:880

            size=0,
            words=0,
            characters=0,
            chunks=0,
            avg_chunk_size=0.0,
            status="empty",
            column_config=column_config_dicts,
            backend_type=backend_type_value,
            backend_config=backend_config_value,
        )

    except HTTPException:
        raise
    except Exception as e:
        # Clean up if something went wrong
        if kb_path.exists():
            KBStorageHelper.delete_storage(kb_path, kb_name)
        await logger.aerror("Error creating knowledge base: %s", e)
        raise HTTPException(status_code=500, detail="Internal error creating knowledge base") from e


@router.post("/preview-chunks", status_code=HTTPStatus.OK)
async def preview_chunks(
    current_user: CurrentActiveUser,
    files: Annotated[list[UploadFile], File(description="Files to preview chunking for")],
    # Upper bounds cap the memory footprint of a preview request.
    # ``max_chunks * chunk_size * CHUNK_PREVIEW_MULTIPLIER`` is the
    # largest text slice this endpoint will hold in memory — without
    # these bounds, an authenticated user can request gigabytes.
    chunk_size: Annotated[int, Form(ge=MIN_CHUNK_SIZE, le=MAX_CHUNK_SIZE)] = 1000,
    chunk_overlap: Annotated[int, Form(ge=MIN_CHUNK_OVERLAP, le=MAX_CHUNK_OVERLAP)] = 200,
    separator: Annotated[str, Form()] = "\n",
    max_chunks: Annotated[int, Form(ge=MIN_MAX_CHUNKS, le=MAX_MAX_CHUNKS)] = 5,
) -> dict[str, object]:
    """Preview how files will be chunked without storing anything.

    Uses the same RecursiveCharacterTextSplitter as the ingest endpoint

View on GitHub (pinned to 976ec789d2)

Solutions

1. Check server logs for the underlying error and retry creating the knowledge base.

When it happens

Trigger: Occurs when an unexpected internal exception is raised during knowledge base creation.

Common situations: See trigger scenarios.

AI-assisted analysis of langflow-ai/langflow@976ec789d2 (2026-08-14). Data as JSON: /api/errors/b58d6be64db147af. Report an issue: GitHub.