After downloading the nightly, I see that it gets past that error, but gets a different error. Even stranger, the regular release also gets the same error, and has gotten past the other error. Perhaps the reason they get the same error is that I created the project from the nightly, and opened the project from both versions.
The cause of the error I see now is relatively obvious. It's generating an incorrect resource path. Instead of "/SSAxis/rest/catalog/item/1", it's generating "/SSAxis/rest/catalog//item/1" (two slashes between "catalog" and "item"). Obviously, my apps fails to find that resource.
