Constantly getting error 302 when trying to export release build

Question

As the title says, I can't export a release build (any more) with Flash Builder 4.7 using AIR 3.5 (or 3.6 beta for that matter).
The compilation process is immediately interrupted with error 302: Root content ... is missing from package.
What can I do about this?
BTW: @Adobe support, please check the forum login! I also constantly get an error 413 wich cancels the login process. Had to go to a computer where my cookie has been saved to get here.
Edit: Using the debugger (iOS Simulator or ADT) works, though. Could someone please shed some light into this? I really have to test a release build.

Answer 1

So, even after setting up a new project, the problem didn't go away. Seems as if the problem sits within the libraries I'm using, though none of them do show any errors or problems.
Edit:
I was wrong accusing Flash Builder on this one! I've had two asset source paths that overlapped and apparently, Flash Builder can't handle that when you try to make a release build. Again, debugging always worked fine. I didn't get any warnings either, so it took me quite some time to even think that that might be an issue.
Still, the pletheora of Flash Builder bugs remains!
Found a new one with is also rather annoying recently;
Open the local history of a file and try to copy some text from that file, you'll instantly get a java nullpointer, resulting in the fact that the text isn't copied to the clipboard.
Edit2:
That last edit was actually based on a premature thought of success. Unfortunately, the project still doesn't compile. There are no errors or problems whatsoever in neither of the library projects or the main project.
Edit3: - Finally solved it!
After re-installing FB4.7, thus overwriting the old installation with all it's SDKs, I figured that the merged SDKs might have been causing this issue.
I've merged SDKs several times before using FB4.7 and it worked fine all the time, the absolutely ridiculous way Adobe forces us to update the AIR SDK with 4.7 is so prone to error, that I might have made a mistake this time though.
So for everyone who struggles with this issue as well, make sure your SDKs are in order! Also check the version numbers in air-sdk-description.xml which is located in the AIRSDK folder.