I was trying to create a custom in-panel widget using the online tutorial (Create a custom in-panel widget—Web AppBuilder for ArcGIS (Developer Edition) | ArcGIS for Developers). I didn't succeed with Step 8. But I went ahead, skipped to step 10, and deployed my widget. I got an error that said: "create widget error: widgets/MyWidget/Widget". I tried tweaking stuff around in Widget.js and Widget.html files. And nothing worked. When I tried to reload my WebApp builder page, I kept getting this crash page:
I also get this same message when I try to load my web app viewer (demo json) page
MyWidget seemed to work pretty well a few hours ago (it showed up as a widget in my WebApp Builder before everything crashed)
Here are My Widget files, please help!!!!!!!