Hi After reading through https://cwiki.apache.org/confluence/display/FLEX/Falcon+Overview I started the building procedure.
Instead of using a flex sdk builded by my own (ant main) I set the reference of the sdk.branch property to the downloaded apache flex sdk 4.8.0. Everything would work except that the java lib flexTasks.jar isn't copied. So i copied the flexTasks.jar manually and the build could finish with no other errors.. Great!! Is it a prerequisite to use sdk builded with ant main? If so, it would be helpful to have this information in the wiki page. cyrill