I just unpacked WebAppBuilderForArcGIS and I ran the startup.bat file. It launches a browser page and requests that I specify the URL for my ArcGIS Online Organization or Portal.
When I enter it, I get back an error: invalid client_id, error 400. What gives?

When looking at the server console, I am noticing a few clues, but not sure how to fix this or if it is infact, the problem. First, I see that the server is listening on ports 3345 and 3346, but that the browser (see above) opens on port 3344. Second, I am seeing a "No token found" message. Any clues on how to fix this?
