Unresolved reference 'qgis'

As an AI language model, I do not have access to your specific code, but an unresolved reference 'qgis' error usually occurs when the QGIS library or module is not properly installed or imported in your code.

Here are some steps you can take to resolve this error:

1. Check if QGIS is installed on your computer. If not, download and install the latest version of QGIS from the official website.

2. Make sure that you have imported the QGIS module in your code using the following statement:

`import qgis`

3. Check the spelling of the module name. The module name should be 'qgis' (all lowercase).

4. Check if the path to the QGIS library is included in your system environment variables. If not, add the path to the 'PYTHONPATH' environment variable.

5. If you are using an IDE (Integrated Development Environment) such as PyCharm or Visual Studio Code, make sure that the QGIS module is included in your project's interpreter.

6. Restart your Python interpreter or IDE after making any changes to ensure that the changes are applied.

If none of these steps work, there may be an issue with your QGIS installation or configuration. In this case, you may need to seek help from the QGIS community or consult the QGIS documentation.