"A failure occured in build()" - Jitsi Desktop Install

Hey guys I am trying to install Jitsi Desktop on Arch but I get a:

BUILD FAILED
/home/user/jitsi/src/jitsi/build.xml:269: Compile failed; see the compiler error output for details.

Total time: 15 seconds
==> ERROR: A failure occurred in build().
    Aborting...

And this is the xml file:
http://ix.io/276k

Any help would be appreciated.
thanks.