XML version of design.xml: Expected XML version: 2

Hello all,

I upgraded to Flash Builder 4.5 and now I get a warning/error for every library project that we have. But it seems to be a warning as I can use the custom library components in Design Mode.

The error is in the tab: "Design Mode Problems"

SWC Configuration issue:

The XML version of design.xml and the expected XML version do not match.Some Design Mode features will not be available for components defined within the SWC
Expected XML version : 2
Actual XML version:  Unknown

The design.xml document starts with:

<?xml version="1.0" encoding="utf-8"?>

I tried changing it to:

<?xml version="2.0" encoding="utf-8"?>

but no effect...

Anyone has the same problem and knows how to fix it?

Thanks!