Software⏱️ 2 min read📅 2026-06-03

How to Fix: Javascript Error: IPython is not defined in JupyterLab

JupyterLab JavaScript error: IPython not defined. Latest Anaconda package used.

Quick Answer: Check JupyterLab settings and ensure the correct kernel is selected for Python 3.6.6.

📋 Table of Contents

  1. ⚠️ Common Causes
  2. ✅ Best Solutions to Fix It
  3. 🎯 Final Words

The 'Javascript Error: IPython is not defined' error in JupyterLab occurs due to a mismatch between the Python version used in JupyterLab and the Python version used by Anaconda. This can happen when you are using an older version of Anaconda that is not compatible with the latest version of JupyterLab.

⚠️ Common Causes

  • Using an older version of Anaconda that is not compatible with JupyterLab.

✅ Best Solutions to Fix It

Method 1: Update Anaconda Package

  1. Step 1: Open a terminal or command prompt and update your Anaconda package using the following command: `anaconda update --upstream`

Method 2: Use JupyterLab with Python 3.7 or Later

  1. Step 1: Install the latest version of Anaconda that includes Python 3.7 or later, and then restart JupyterLab.

🎯 Final Words

By following these steps, you should be able to resolve the 'Javascript Error: IPython is not defined' error in JupyterLab and successfully plot your data using Python 3.6.6.

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