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If you're using the beta 1 build, it could be you're running into http://bugs.adobe.com/jira/browse/SDK-21484? If so, try swapping in the mxmlc.jar attached to that bug.
Hello and thank you.
My problem was solved by updating the SDK to 18.104.22.16809
I think the problem is not only in the compiler but in the SkinnableComponent as patching the method findParts(), as suggested in other post, works too.