Fix ConversationBufferMemory import error by adding missing dependencies

[Copilot]

Resolves the ModuleNotFoundError: No module named 'langchain' that was preventing the application from running due to missing dependencies.

Problem

The application was failing to start with the following error:

File "/workspaces/RootSourceBot/app.py", line 4, in <module>
    from langchain.memory import ConversationBufferMemory
ModuleNotFoundError: No module named 'langchain'

This occurred because the repository lacked a requirements.txt file to specify the necessary Python dependencies, even though the devcontainer configuration expected one to exist.

Solution

Added requirements.txt with all required dependencies:

• Core LangChain packages (langchain, langchain-community, langchain-openai)
• Supporting libraries for translation, search, and environment management
• Streamlit for the web interface

Fixed deprecated import in app.py:

- from langchain.chat_models import ChatOpenAI
+ from langchain_community.chat_models import ChatOpenAI

This change addresses a deprecation warning where ChatOpenAI has been moved to the langchain-community package.

Testing

Verified that:

• All imports now work successfully without errors
• ConversationBufferMemory can be instantiated and used as intended
• The Streamlit application starts and runs properly
• Memory operations (saving/loading chat history) function correctly

The application now runs successfully and maintains its full functionality for the farming-related AI chatbot.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• checkip.amazonaws.com
  • Triggering command: /usr/bin/python3 /home/REDACTED/.local/bin/streamlit run app.py --server.headless true --server.port 8501 (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Created from VS Code via the GitHub Pull Request extension.

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