is your ant instance using the new flex tasks jar from the 4.11 sdk?
> Date: Wed, 27 Nov 2013 16:35:01 -0600 > Subject: Ant build and SDK 4.11 > From: markzolo...@gmail.com > To: users@flex.apache.org > > I am trying to execute builds that worked fine with 4.5.1. But I am getting > the following error: > Error: No signed digest found in catalog.xml of the library, > \........\Flex\SDK\4.11.0\frameworks\libs\framework.swc. Compile the > library with -create-digest=true and try again. > > Can some please give me a clue what I should be looking for? > > Thanks