debugging ant built program

Hi,

I have this program that I use Ant to manage, it works well, but I can't use Intellij's build/run, it has an error and I can't figure out what needed to be adjusted in the Intellij's option.

Anyway, now I need to set a break point and run in debug mode, but can't find a way to do this in the Ant build, any tips? Thanks.
A.C.