I'm starting to use Wolfram Workbench 2 to develop a Mathematica package. For the first time I tried "Documentation - Build" under the "Application Tools" but got fatal errors:
BUILD FAILED /Users/[...]/docbuild.xml:132: The following error occurred while executing this line: /Users/[...]/docbuild.xml:90: taskdef A class needed by class com.wolfram.jlink.util.MathematicaTask cannot be found: org/apache/tools/ant/Task
This is with Mathematica 126.96.36.199 on a Mac with OS 10.9.
Any idea on what's wrong here?