I am trying to build a custom widget using the Web App Builder Developer Edition. When I ran the batch file and imported the Demo widget at the position 4 in the off-panel widget and when I click it, it's not showing anything and keeps on loading. When I see in the console, it's showing a GET error with 404 (Not Found). Can anyone help me in fixing this? I am yet to host this application into our web server. I am currently running it on my local machine. Below are the screenshots of my chrome console and folder structure.