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Unexpected Flex build error

I just had a weird one I thought I’d share on here in case anyone else has it. Or in case I get it again for that matter. I kept getting the same error from Flex Builder :

“An internal build error has occurred. Right-click for more information.”

After much searching and sulking I found the culprit. It was an swc file with a MovieClip in. It turns out that the animator had left a blank keyframe in there. And the blank keyframe had a motion tween on it. Get rid of the tween, and it all works fine.

I suppose I should submit it as a bug but I’m a bit busy right now… :-S

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