I recently found Mike Chambers\' as3corelib when looking for ways to render the stage to a file. Works great in my ActionScript 3.0 project in Flash Professional (CS6 if it matt
Don't know whether you got this one licked or not, but I hit the same thing. Love the library, hate the error messages.
I downloaded the Flex SDK from here:
Adobe Flex SDK Download
Then, I unzipped that into a temporary folder.
Then, since I didn't want the whole flex framework lurking about, I created a ./lib directory inside the directory where the .fla file lives. I then moved these swcs from here (Inside the unzipped file structure):
mv ~/Downloads/flex_sdk_4.6/frameworks/libs/framework.swc ./lib
mv ~/Downloads/flex_sdk_4.6/frameworks/libs/core.swc ./lib
mv ~/Downloads/flex_sdk_4.6/frameworks/libs/mx/mx.swc ./lib
Not sure why all three were required, but it stopped the compiler complaining (and got the date conversions working).
You need to add them to the .fla's library list as well (under ActionScript Settings); but I'm betting you already knew that.
Perhaps useful, perhaps not.