Error from sandbox: [bad_request] python-3.14.4 runtime is unknown

[luis-silva-idb]

Hi,

Looking for guidance here as I might be doing something wrong...

Tried the same prompt from the introduction video available here: https://www.librechat.ai/docs/features/code_interpreter#introduction

Create a fictional dataset for a small store's sales data over a 30-day period. The dataset should include the following columns: Date (for each day in the period), Product, Quantity, Price per Unit, and Total Sales. Include a variety of products with different prices.

Once the dataset is created, perform the following data analysis tasks:

Calculate the total sales revenue generated over the month.
Identify the best-selling product based on total sales.
Compute the average sales per day.
Create a plot showing the trend of sales over the month.

Provide the Python code for each step, including data generation, calculations, and plotting. Assume you are using libraries such as pandas, numpy, and matplotlib for this task. also make sure to save the data as a csv

My LibreChat .env file has the following configured:

LIBRECHAT_CODE_BASEURL=http://host.docker.internal:3112/v1
LIBRECHAT_CODE_API_KEY=507588(...)bc5c21

My CodeInterpreter has the following configured:

SANDBOX_ACCESS_TOKEN=507588(...)bc5c21

When running the prompt from LibreChat, I get the following error on the CodeInterpreter API:

api               | {"level":"error","message":"[fZfuK_al0-dmDbFWE2Fmy] Session ID: g7F-esjgiAZJEEteYNfKB | User ID: 68e4db9264e2808479086840 | Error during execution: Error from sandbox: [bad_request] python-3.14.4 runtime is unknown","service":"service-api","stack":"Error: Error from sandbox: [bad_request] python-3.14.4 runtime is unknown\n    at G (/app/.build-api/api-server.js:467:32026)\n    at emit (node:events:98:22)\n    at emit (/app/.build-api/api-server.js:8353:1478)\n    at consumeEvents (/app/.build-api/api-server.js:8353:11094)\n    at async run (/app/.build-api/api-server.js:8353:10470)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-06-26T14:00:24.034Z"}

I'm running both LibreChat and CodeInterpreter through Docker Desktop with WSL2.

[danny-avila]

Hi @luis-silva-idb, your LibreChat URL/token config looks fine. The error means the sandbox runner does not have the Python runtime installed/registered.

The Code Interpreter maps Python requests to python version 3.14.4, and the sandbox only discovers runtimes from /pkgs. The README/troubleshooting notes that "runtime is unknown" usually means the language packages volume is empty because the package-init step did not run.

For local Docker Compose, populate ./data/pkgs first, then restart the stack:

cd /path/to/code-interpreter

./build-packages.sh

docker compose up --build

[luis-silva-idb]

It worked wonders, thanks!