Trouble Import Flash Builder 4 project into Flash Builder 4.5

Hi,

I have quite a lot of Flash Builder 4 Air project which I would like to convert all of them into Flash Builder 4.5 project. However, after I tried to import it into 4.5, the project got error and saying that "application descriptor not found".

I am posting it here because I believe it is due to improper import of the air project into 4.5. Flash Builder 4.5 should be intelligent enough to solve the problem when converting the project. Hope there will be a fix for it soon

Btw, how can I manually solve this problem so that I can get all my previous projects run on 4.5? Thanks.