@cyberfunk - I've had similar issues with the compatibility mode
flag.  I'm able to get it working in FlashBuilder but not via the CL
compilers.  The way I finally solved the issue was to add the -dump-
config option followed by a path to the FlashBuilder project and check
the Flex 3 compatibility box.  This will produce a flex-config.xml
file at the path you provided.  From there you can use that flex-
config.xml with the CL compiler (Ant, FM, etc) to get things working.
I think there is still some disconnect between builder and the CL
compilers, so hopefully this will be fixed soon.  I may have missed
something major however, but this was my approach.

The only other suggestion I can make is to go through the migration
guide Adobe put out @ 
http://www.adobe.com/devnet/flex/articles/flex3and4_differences_03.html.
Hope this helps.

-Brian

On Dec 1, 9:02 am, cyberfunk <[email protected]> wrote:
> I'm wondering whether anyone has run into this issue.
>
> I'm compiling using Flex 4 but need backward compatibility mode
> enabled in order to also use Flex 3 components (halo) in conjunction
> with the new Spark components.
>
> Essentially, I get compiler errors on the 'mx' namespace when
> compiling using the Flex 4 SDK with flexmojos.
>
> I tried adding a dependency on the Flex 3 framework but this produces
> a whole new set of errors which appears to be related to a duplication
> of some of the 'mx' classes between the Flex 3/4 swc files.
>
> I've tried specifying the <compatibilityVersion /> configuration, but
> whatever I set it to: 3, 3.0, 3.2 fails with the error:
>
> [INFO] Invalid compatibility version 3.0
>
> Has anyone managed to get Spark+Halo working with flexmojos?
>
> Cheers,
>
> mischa.

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