qtwebchannel' is not defined

This error message typically indicates that the QtWebChannel module has not been imported properly in your Python code.

To fix this issue, you can try adding the following import statement at the beginning of your Python script:

from PyQt5.QtWebChannel import *

Make sure that you have installed the PyQt5 package, which includes the QtWebChannel module, using pip or another package manager. Also, ensure that you are using the correct version of PyQt5 that is compatible with your Python version.

If the issue persists, you may also want to check that your code is correctly referencing the QtWebChannel module in your HTML and JavaScript files. Make sure that the necessary scripts are included and loaded properly, and that the channel name matches the one defined in your Python code.