I am getting the following error when I try to debug my GWT app. I am quite sure it is a problem with my code, I just don't know how to find where the problem is.

My immediate goal is to find and fix this particular error. My ultimate goal is, obviously, to be able to debug my application in Eclipse.

Steps used:

1. Right click project in Eclipse, choose "GWT development mode with jetty"
2. Right click URL in GWT "Development Mode" tab, and choose "Open with SDJB Chrome JS Debugger"
3. Browser pops up, with error saying "Could not load application from super dev mode. Make sure your super dev mode server is running and url is properly configured, host: 127.0.0.1 port: 9876 module: wmsapp"
4. In eclipse, under browser window, I see the below error. I don't see errors anyplace else in Eclipse.
5. In browser, with "Developer Tools" enabled, I do see a CORS error, refusing to load some script, and a failure to load the "favicon.ico". I don't see how this could cause the below error message, but who knows.
6. I then try right clicking URL and "Open with Chrome", and get the same browser issues. I never get the below error again, even on browser refreshes.
7. I then stopped the debugger, ran it again, and right clicked URL with "Open with Chrome", no error below, but same browser errors
8. I then right clicked and selected "Open with SDJB Chrome JS Debugger", got error below.

So it seems I only get the error below with "Open with SDJB Chrome JS Debugger" on my application. When I do it on a demo application, it works fine, so it is definitely a problem with my application. Any ideas? Where can I look for the true problem in my code?