Error during export iOS application

Hi everyone,
I'm currently working on an iOS application using FlashBuilder and AIR.

I can run or debug it, it works fine.
But when I try to package it, I've always the same error message :

no such file /Users/yannraude/Documents/Adobe Flash Builder 4.7/myproject/bin-release-temp/AOT/icons

Don't know if there's a problem with my icon, but the fact is, I've got the right icon when I debug the application on my iPad. I have this error only when I try to export my application (for now it's a AdHoc version) ; works on the french Flash Builder, it's called Projet > exporter une version validée
I've try it with both dev and distrib apple certificate, and with the right mobilprovision file for adhoc application.

Any ideas ?

Thanks a lot.