Unable to build iOS in Flash Builder 4.6

I have created iOS before with the flash builder 4.6 but today when I try to create Flash builder will start after it ask if I want to overwrite exsisting api file and then after 5 minutes, the bar never moves the hourglass is going, it close the "Export Release Build" window.

No errors and not the window telling that have build api file.

Using Windows 7 64

Any one have the same problem?

Kim