Unable to compile non-modular Java project with Ant #147

Buildfile: /home/prrvchr/github/vCardOOo/source/vCardOOo/build.xml
init-env:
     [echo] Initializing the properties for LibreOffice
     [echo] Office libs path: /lib/libreoffice/program
     [echo] Workspace path: /home/prrvchr/github/vCardOOo/source
    [mkdir] Created dir: /home/prrvchr/github/vCardOOo/source/vCardOOo/build/idl
    [mkdir] Created dir: /home/prrvchr/github/vCardOOo/source/vCardOOo/build/idl/urd
    [mkdir] Created dir: /home/prrvchr/github/vCardOOo/source/vCardOOo/build/idl/rdb
     [echo] Project SDK use idlc
     [echo] Project language Java
init-java:
     [echo] Project is Java

BUILD FAILED
/home/prrvchr/github/vCardOOo/source/vCardOOo/build.xml:145: You must specify value, location or refid with the name attribute

Total time: 3 seconds