Cordova Barcode Scanner

Question

https://www.c-sharpcorner.com/UploadFile/020f8f/barcode-scanner-cross-platform-app-using-cordova-in-visual-s/

 

Following the steps in the above project, I get an app which has the background in stripes, a button which prompts you to scan, but once clicked on, nothing happens. I really need to get this application working for a project of mine, could you please guide me on how to fix this? Thanks.