ModuleNotFoundError: No module named 'ipywidgets'

If you are encountering a `ModuleNotFoundError: No module named 'ipywidgets'` error, it means that the `ipywidgets` module is not installed in your Python environment.

Here's a step-by-step guide to install `ipywidgets`:

1. Make sure you have `pip` (Python package installer) installed. You can check this by running `pip --version` in your command prompt or terminal. If it's not installed, you can install it by following the instructions at https://pip.pypa.io/en/stable/installing/.

2. Once you have `pip` installed, you can install `ipywidgets` by running `pip install ipywidgets` in your command prompt or terminal.

If you are using Jupyter Notebook or JupyterLab, you may also need to install the Jupyter extension for `ipywidgets`. You can do this by running the following commands:

   pip install jupyterlab
   jupyter labextension install @jupyter-widgets/jupyterlab-manager

3. After the installation is complete, restart your Jupyter Notebook or JupyterLab server if you are using them.

Now, you should be able to import and use the `ipywidgets` module without any issues.