[Question]: TypeError: 'NoneType' object is not callable

[xinkeyb]

Question Validation

• I have searched both the documentation and discord for an answer.

Question

Can someone help me? I would greatly appreciate it

The previous code worked fine and generated an answer, but in the end, an error was always reported:

Exception ignored in: <function Driver.del at 0x7f5670ae5ca0>
Traceback (most recent call last):
File "/home/zhaoxinke/miniconda3/envs/kgllm2/lib/python3.9/site-packages/neo4j/_sync/driver.py", line 485, in del
File "/home/zhaoxinke/miniconda3/envs/kgllm2/lib/python3.9/site-packages/neo4j/_meta.py", line 226, in unclosed_resource_warn
TypeError: 'NoneType' object is not callable

[dosubot[bot]]

Answer generated by a 🤖

Answer

Hello,

The error you're encountering, "TypeError: 'NoneType' object is not callable", typically happens when you're trying to call a method on an object that is None. In your case, it seems like the error is coming from the Driver.__del__ method in the neo4j package.

The Driver.__del__ method is a destructor that is called when the object is about to be destroyed. If an error occurs in this method, it's usually because the object or its resources have already been cleaned up or are in an invalid state.

From the traceback, it seems like the error is happening in the unclosed_resource_warn function. This function is likely trying to call a method or function that is None, which is causing the error.

Without more information, it's hard to say exactly what's causing the error. However, it could be that the Driver object is being deleted before its resources have been properly cleaned up.

To debug this issue, you could try the following:

1. Check if the Driver object is being used after it has been deleted. If it is, you'll need to ensure that it's not deleted until after you're done using it.

2. Check if there's an issue with the unclosed_resource_warn function. It could be that this function is trying to call a method or function that doesn't exist or has already been deleted.

3. Check if there's an issue with the way you're using the neo4j package. You might be using it in a way that's causing the Driver object to be in an invalid state when it's deleted.

I hope this helps! If you're still having issues, please provide more information about how you're using the neo4j package and the Driver object, and I'll do my best to assist you further.

Best regards,
Dosu

Sources

• llama_index/llms/xinference.py

---

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[xinkeyb]

In fact, I am using The example code in the llama_index's document. No changes have been made to it.

This is th whole code:

import os
import openai
import logging
import sys
from llama_index.llms import CustomLLM, CompletionResponse, LLMMetadata
from llama_index.llms.base import llm_chat_callback, llm_completion_callback
from llama_index import ServiceContext
import torch
from transformers import pipeline
from typing import Optional, List, Mapping, Any

from llama_index import (
    ServiceContext,
    SimpleDirectoryReader,
    LangchainEmbedding,
    ListIndex
)

from llama_index.llms.base import CompletionResponseGen
from llama_index.callbacks import CallbackManager

openai.api_key = "sk-HimVsxWOdru4j46CdRq9eR8GXnWpCtVbyO5y4L8JeAt9c9EH"


import logging
import sys
from llama_index.llms import OpenAI
from llama_index import ServiceContext

logging.basicConfig(stream=sys.stdout, level=logging.INFO)

# define LLM
llm = OpenAI(temperature=0, model="gpt-3.5-turbo")
service_context = ServiceContext.from_defaults(llm=llm, chunk_size=512, embed_model="local")


from llama_index import (
    KnowledgeGraphIndex,
    LLMPredictor,
    ServiceContext,
    SimpleDirectoryReader,
)
from llama_index.storage.storage_context import StorageContext
from llama_index.graph_stores import Neo4jGraphStore

from llama_index.llms import OpenAI
from IPython.display import Markdown, display


username = "neo4j"
password = "Shb9Sy5q_j_5hw_ZybKyfr6SPQsqqdB7Z-Xza4-pgQ"
url = "neo4j+s://46de362d.databases.neo4j.io:7687"
database = "neo4j"



documents = SimpleDirectoryReader(
    "./data"
).load_data()

graph_store = Neo4jGraphStore(
    username=username,
    password=password,
    url=url,
    database=database,
)

storage_context = StorageContext.from_defaults(graph_store=graph_store)



from llama_index.query_engine import KnowledgeGraphQueryEngine

query_engine = KnowledgeGraphQueryEngine(
    storage_context=storage_context,
    service_context=service_context,
    llm=llm,
    verbose=True,
)


response = query_engine.query("小明在哪里出生")
display(Markdown(f"<b>{response}</b>"))

This is the result:

INFO:sentence_transformers.SentenceTransformer:Load pretrained SentenceTransformer: sentence-transformers/all-MiniLM-L6-v2
INFO:sentence_transformers.SentenceTransformer:Use pytorch device: cuda
Graph Store Query: MATCH (p:Person {name: '小明'})-[:出生于]->(l:Location)
RETURN l.name
INFO:llama_index.query_engine.knowledge_graph_query_engine:Graph Store Query: MATCH (p:Person {name: '小明'})-[:出生于]->(l:Location)
RETURN l.name
Graph Store Response: [{'l.name': '中国'}]
INFO:llama_index.query_engine.knowledge_graph_query_engine:Graph Store Response: [{'l.name': '中国'}]
Final Response: 小明在中国出生。
小明在中国出生。
Exception ignored in: <function Driver.__del__ at 0x7fd572b36ca0>
Traceback (most recent call last):
  File "/home/zhaoxinke/miniconda3/envs/kgllm2/lib/python3.9/site-packages/neo4j/_sync/driver.py", line 485, in __del__
  File "/home/zhaoxinke/miniconda3/envs/kgllm2/lib/python3.9/site-packages/neo4j/_meta.py", line 226, in unclosed_resource_warn
TypeError: 'NoneType' object is not callable

[logan-markewich]

@xinkeyb does this error stop execution? It seems like it printed the final response there, the "error" just happens on shutdown?

[dosubot[bot]]

The error "TypeError: 'NoneType' object is not callable" typically occurs when trying to call a method on an object that is None. In your case, it seems to be related to the Driver.__del__ method in the Neo4j package, which is a destructor called when the object is about to be destroyed.

This issue often arises when the object or its resources have already been cleaned up or are in an invalid state. Here are some steps to debug and potentially resolve this issue:

1. Check Object Usage: Ensure that the Driver object is not being used after it has been deleted. Make sure all operations on the Driver object are completed before it is destroyed.

2. Error Handling: Add error handling to check if the Driver object is None before calling any methods on it. This can help in identifying if the object is in an invalid state.

3. Neo4j Package Usage: Verify that the Neo4j package is being used correctly. Ensure that the connection parameters (URL, username, password) are correct and that the connection to the Neo4j database is established properly.

4. Explicit Cleanup: Implement an explicit cleanup method to close the Neo4j driver when it is no longer needed. This can help in ensuring that resources are properly released.

Here is an example of how you can add a cleanup method to close the Neo4j driver:

class Neo4jGraphStore:
    # Existing initialization code...

    def close(self) -> None:
        if self._driver:
            self._driver.close()

# Usage
graph_store = Neo4jGraphStore(
    username=username,
    password=password,
    url=url,
    database=database,
)

# Perform operations...

# Explicitly close the driver
graph_store.close()

This should help in ensuring that the Neo4j driver is properly closed and resources are released, potentially preventing the NoneType error during shutdown.

For more details, you can refer to similar issues and their solutions:

• [Question]: TypeError: 'NoneType' object is not callable
• [Question]: nebula close connection happened an exception !

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[akuten1298]

@xinkeyb running into the same issue, were you able to find a fix for this?

[casualcomputer]

I ran the demo codes from the LlamaIndex documentation on this page, and they worked fine on Google Colab. To replicate the environment on my laptop, I made sure to match the same llama_index versions as used on Colab. However, when I call LlamaCPP, I encounter the same error described in the original post. If I load the LLM with the Llama class from the llama_cpp library, the errors don't occur.

[sumedha73]

This seems to be some issue on Neo4j end because I too am getting the same error using langchain’s graphcypherqachain to call graphdb.