ModuleNotFoundError: No module named 'models.gc'

This error occurs when Python cannot find the module named 'models.gc'. The most common reasons for this error are:

1. The module is not installed: Make sure that the 'models.gc' module is installed in your Python environment. You can use the 'pip' command to install it.

2. The module is not in the correct directory: Double-check that the 'models.gc' module is in the correct directory. It should be in a folder named 'models' and that folder should be in the same directory as your Python script.

3. The module name is misspelled: Check that you spelled the module name correctly. Even a small typo can cause this error.

4. Python path is not set correctly: Check that your Python path is set up correctly. Sometimes, if you have multiple versions of Python installed, your system may be using the wrong version.

Once you have resolved the issue, try importing the module again in your Python script.