Check out the code from the GitHub repository and ensure that you see the following files in the ch07/app/view/main folder:
Cartesian.js: This has the cartesian chart-related code and its style-related code.Polar.js: This has the polar chart with the radar series and its style-related code.Pie.js: This has the polar chart with the pie series and contains the pie series-specific styling code.ch07/app.js: This contains the following line, which you will have to modify to try different classes, mentioned above:autoCreateViewport: 'SCE.view.main.Cartesian'