Ok so I’ve solved this BIG Bug. I’m using FlashDevelop and the compilation goes very well, unfortunately.

I deploy the Flex App and all seems to go well. When I click on the application the error into the post subject has been launched.

What’s your solution man?

I’ve an MXML component with <Application .. /> tag, but this component it’s not the main component. So it’s an error! But FlashDevelop says nothing. So your Flex App couldn’t understand which main MXML is and you obtain a lot of strange errors.

Please fill with comments if you have can contribute.