LangChain Common Errors

Overview

Quick reference for diagnosing and resolving the most common LangChain errors.

Prerequisites

• LangChain installed and configured
• Access to application logs
• Understanding of your LangChain implementation

Error Reference

Authentication Errors

openai.AuthenticationError: Incorrect API key provided

# Cause: Invalid or missing API key
# Solution:
import os
os.environ["OPENAI_API_KEY"] = "sk-..."  # Set correct key